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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230704T113000
DTEND;TZID=Europe/Rome:20230704T123000
DTSTAMP:20260404T205326
CREATED:20230417T134921Z
LAST-MODIFIED:20230523T071854Z
UID:11405-1688470200-1688473800@www.oa-roma.inaf.it
SUMMARY:colloquium - Steven Finkelstein: Unveiling the Earliest Galaxies and Super-massive Black Holes with JWST
DESCRIPTION:Pushing the Hubble Space Telescope to its limits at the end of the last decade has allowed astronomers to view the tip of the cosmic iceberg at a time only 500 Myr after the Big Bang.  While a few candidate galaxies were found\, significant questions about the onset and evolution of the earliest galaxies persisted.  The launch of JWST has opened up this epoch to direct and detailed observation by providing a significant leap in our ability to study the entire epoch of reionization due to its redder sensitivity and spectroscopic capabilities.  The Cosmic Evolution Early Release Science (CEERS) and Next Generation Deep Extragalactic Exploratory Probe (NGDEEP) programs have enabled one of our first looks into this epoch\, finding that galaxies at z > 9 are more abundant than predicted by most simulations.  This hints at not only an early onset of galaxy formation\, but that stars are forming differently at these early times (at higher efficiency and/or with different initial mass functions).  The CEERS spectroscopic program has shown that photometric redshifts *work*\, with a high fraction of spectroscopic confirmations\, and only one (interesting\, yet rare) case of contamination.  These data have also significantly improve our ability to identify early growing supermassive black holes\, showing that they appear (relatively) frequently at high-redshift\, including a remarkable AGN at z=8.7.  These observations pushing models of early black hole growth\, implying that massive seeds and/or super-Eddington accretion are needed at early times.
URL:https://www.oa-roma.inaf.it/event/colloquium-steven-finkelstein/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230627T113000
DTEND;TZID=Europe/Rome:20230627T123000
DTSTAMP:20260404T205326
CREATED:20230405T135705Z
LAST-MODIFIED:20230615T073616Z
UID:11379-1687865400-1687869000@www.oa-roma.inaf.it
SUMMARY:Colloquium - Kenneth Wong: An Independent Measurement of H0 from Lensed Quasars
DESCRIPTION:Strong gravitational lens systems with time delays between the multiple images are a powerful probe of cosmology\, particularly of the Hubble constant (H0).  This independent method is an important test of the recent tension between early-Universe and late-Universe measurements of H0.  The TDCOSMO project has measured H0 from lensed quasars using deep Hubble Space Telescope and AO imaging\, precise time delay measurements from dedicated monitoring observations\, a measurement of the velocity dispersion of the lens galaxies\, and a characterization of the mass distribution along the line of sight.  Assuming well-motivated physical profiles for the lens galaxies\, our latest results constrain H0 to be ~74 km/s/Mpc for a flat Lambda CDM cosmology\, with a precision of ~2%.  These results are consistent with independent determinations of H0 using type Ia supernovae calibrated by the distance ladder method\, and are in >4-sigma tension with the results of Planck CMB measurements\, hinting at possible new physics beyond the standard LCDM model and highlighting the importance of this independent probe.  Relaxing our assumptions on the form of the lens galaxy mass profiles and only allowing kinematic constraints\, we can constrain H0 to ~8% precision.  Including information from external data sets can improve the precision to ~5%.  Future observations to increase the sample size and control systematic uncertainties will be key to resolving the current tension in H0.
URL:https://www.oa-roma.inaf.it/event/colloquium-kenneth-wong/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230620T113000
DTEND;TZID=Europe/Rome:20230620T123000
DTSTAMP:20260404T205326
CREATED:20230325T100149Z
LAST-MODIFIED:20230607T112933Z
UID:11372-1687260600-1687264200@www.oa-roma.inaf.it
SUMMARY:colloquium - Gabriele Cescutti: First results of the MINCE survey
DESCRIPTION:The struggle to find the most metal port stars in our Galaxy has produced an important bias in the observations and the intermediate metal-poor stars (-2.5<[Fe/H]< -1.5)\nhave been frequently overlooked. The missing information has consequences for the precise study of the chemical enrichment of our Galaxy\, in particular for\nwhat concerns neutron capture elements. Measuring at intermediate metallicity neutron capture elements (MINCE) aims to cover this gap\, gathering\nhigh quality spectra (high signal to noise and high resolution) of several hundred bright and metal poor stars\, manly from of our Galactic halo.\nIn this talk\, I show the results of the first sample of 42 stellar spectra for 40 different stars with the abundances of the elements up to europium. I also present\n the results for the hyperfine splitting effects in two metal-poor halo stars: the profiles of the barium lines in HD 4306 agree with an s-process composition whereas\nthose in HD 6268 have a different profile\, most likely linked to the presence of an r-process isotopic pattern. Therefore\, the lines of barium of HD 6268 and HD 4306\nseem to confirm the expectation that both r-process events and s-process contribution by rotating massive stars have polluted the ancient halo of our Galaxy.
URL:https://www.oa-roma.inaf.it/event/colloquium-gabriele-cescutti-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230615T113000
DTEND;TZID=Europe/Rome:20230615T123000
DTSTAMP:20260404T205326
CREATED:20230523T071652Z
LAST-MODIFIED:20230529T084702Z
UID:11567-1686828600-1686832200@www.oa-roma.inaf.it
SUMMARY:colloquium - Stephane Courteau: Puzzles in Galaxy Structure
DESCRIPTION:Galaxies like our Milky Way can be described in terms of their structure\,\ndynamics\, and stellar populations. Some robust correlations between\ngalaxy structural properties such as stellar mass\, circular velocity\, and \nsize display surprisingly small scatter over many orders of magnitude\, \nhinting at well-regulated galaxy formation processes. A major challenge \nto understanding these scaling relations\, their tight scatter\, and ultimately \ngalaxy formation and evolution\, is the elusive interplay between visible \nand dark matter.  Among others\, the radial acceleration relation\, concept \nof “galaxy diversity”\, intrinsic scatter in galaxy scaling relations\, impact\nof supermassive black hole on galaxies\, and comparisons with numerical \nsimulations of galaxy formation are presented in this context.
URL:https://www.oa-roma.inaf.it/event/colloquium-stephane-courteau/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230606T113000
DTEND;TZID=Europe/Rome:20230606T123000
DTSTAMP:20260404T205326
CREATED:20230210T064844Z
LAST-MODIFIED:20230530T062309Z
UID:11289-1686051000-1686054600@www.oa-roma.inaf.it
SUMMARY:colloquium - Shuowen Jin: Massive galaxies and clusters in the making: Multi-wavelength study of optically-dark SMGs and galaxy overdensities at z>2.5
DESCRIPTION:Recent studies have revealed an important population of submillimeter galaxies (SMGs) that dropped out in deep optical surveys\, however their nature is still largely unknown. On the other hand\, high-z protoclusters are often suspected to be forming the local massive clusters\, while the evolutionary path is still elusive. Thus discovering more SMGs and galaxy overdensities towards high redshift are key to pushing our understanding of the formation of massive galaxies and structures. Here I report recent discoveries and study on the two topics from our team\, including (1) spectroscopic confirmation of a sample of optically-dark SMGs at z~4–6 using ALMA\, NOEMA and JWST; (2) detailed insight into a z=2.58 HST-dark SMG by synergy of JWST and ALMA data; (3) discovery of protoclusters and compact galaxy groups at z~3–5 using NOEMA\, ALMA and JWST. We found that most of the optically-dark SMGs have optically thick dust in FIR\, and they consist of s significant fraction of star-forming galaxies at z~4. By comparison with simulations\, we revealed that low-mass and compact galaxy groups most likely merge into single massive galaxies at lower-z\, i.e.\, “proto-massive galaxy”\, while only the most massive protoclusters are likely to evolve to local clusters.
URL:https://www.oa-roma.inaf.it/event/colloquium-showen-jin/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230530T113000
DTEND;TZID=Europe/Rome:20230530T123000
DTSTAMP:20260404T205326
CREATED:20230210T064708Z
LAST-MODIFIED:20230520T105901Z
UID:11287-1685446200-1685449800@www.oa-roma.inaf.it
SUMMARY:colloquium - Michele Perna: First results from the JWST GTO programme 'Galaxy Assembly with NIRSpec IFS’ (GA-NIFS):  The gaseous environment and ISM properties of quasars at z = 3-7
DESCRIPTION:The JWST/NIRSpec GTO programme ‘Galaxy Assembly with NIRSpec IFS’ (GA-NIFS) is an ambitious project aimed at characterising the internal structure of >40 distant galaxies and active galactic nuclei (AGN) and quasars (QSOs) at z=3-9\, and\, therefore\, to investigate the primary physical processes driving galaxy evolution across cosmic time. In this talk I will present an overview of the very first results obtained from a subsample of QSOs\, as well as the analysis and the knowledge on optimising the QSO-host decomposition in NIRSpec IFS data (Perna et al. 2023\, Marshall et al. 2023\, Übler et al. 2023).\nI will discuss the interacting environment of two QSOs at z~6.8 and one at z~5.5\, as well as the ultra-dense environment of a dual AGN at z~3.3. I will also present their interstellar medium properties\, in terms of dynamical conditions\, ionisation\, metallicity\, and outflows energetics. In particular\, I will discuss the limitations of classical emission line diagnostics to distinguish between AGN and star formation ionisation source\, and the relation between black hole masses and host galaxy properties in the context of other recent JWST results on high-z QSOs.
URL:https://www.oa-roma.inaf.it/event/colloquium-michele-perna/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230523T113000
DTEND;TZID=Europe/Rome:20230523T123000
DTSTAMP:20260404T205326
CREATED:20230325T095954Z
LAST-MODIFIED:20230515T153733Z
UID:11370-1684841400-1684845000@www.oa-roma.inaf.it
SUMMARY:colloquium - Alessandra De Rosa: The quest for dual and binary supermassive black holes
DESCRIPTION:Hierarchical models of galaxy formation predict that galaxy mergers represent a key transitional stage of rapid SMBH growth; however\, the lack of a census of AGN pairs over cosmic time prevents us from firmly connecting AGN triggering and merging processes.\nThe quest for pairs of SMBHs at the dawn of the multi-messenger era is compelling. These systems represent the natural precursor to coalescing SMBHs that are among the loudest sources of gravitational waves.  Detecting dual AGN – active SMBHs at projected separations larger than several parsecs – and binary AGN – active SMBHs  bound in a Keplerian binary – is an observational challenge.\nThe talk will review the observational efforts\, across the electromagnetic spectrum\, on the detection and study of dual and binary SMBHs and will reflect on broader implications of these findings when considering the current simulations of merging BH.
URL:https://www.oa-roma.inaf.it/event/colloquium-alessandra-de-rosa/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230517T143000
DTEND;TZID=Europe/Rome:20230517T153000
DTSTAMP:20260404T205326
CREATED:20230210T065013Z
LAST-MODIFIED:20230210T065013Z
UID:11291-1684333800-1684337400@www.oa-roma.inaf.it
SUMMARY:JAC Colloquium: Bertrand Lamasle
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/jac-colloquium-bertrand-lamasle/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20230509
DTEND;VALUE=DATE:20230510
DTSTAMP:20260404T205326
CREATED:20230210T064205Z
LAST-MODIFIED:20230210T064205Z
UID:11281-1683590400-1683676799@www.oa-roma.inaf.it
SUMMARY:OAR student's day
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/oar-students-day/
LOCATION:Aula Gratton
CATEGORIES:Congressi
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230418T113000
DTEND;TZID=Europe/Rome:20230418T123000
DTSTAMP:20260404T205326
CREATED:20230210T064525Z
LAST-MODIFIED:20230417T042938Z
UID:11285-1681817400-1681821000@www.oa-roma.inaf.it
SUMMARY:colloquium - Eilat Glikman: Understanding the role of Quasar feedback and Radio emission in red Quasars
DESCRIPTION:Observational evidence suggests that quasar activity plays an important role in regulating how \ngalaxies and their nuclear supermassive black holes grow and co-evolve\, despite their \norders-of-magnitude difference in scale. In this talk\, I will present a population of highly \nluminous dust-reddened quasars that may be the key to understanding this co-evolution. Red \nquasars are among the most intrinsically-luminous quasars in the Universe representing a \nshort-lived phase in the lifetime of a quasar\, during which their energy output (feedback) \nirrevocably impacts their host galaxy. Recent evidence has also shown that red quasars have \nenhanced radio emission\, possibly linking the formation of jets to the merger phenomenon or \nexposing a different form of feedback in these systems\, such as dusty radiation-driven winds. \nRed quasars are thus ideal laboratories for addressing fundamental questions on the co-evolution \nof black holes and their host galaxies as well as the physics of feedback. I will present \nfindings from several surveys that are uncovering this elusive population of quasars using \nvarious selection methods across the electromagnetic spectrum to probe a broad range of redshift \nand luminosity regimes.
URL:https://www.oa-roma.inaf.it/event/colloquium-eliat-glikman/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230404T113000
DTEND;TZID=Europe/Rome:20230404T123000
DTSTAMP:20260404T205326
CREATED:20230210T064348Z
LAST-MODIFIED:20230322T075149Z
UID:11283-1680607800-1680611400@www.oa-roma.inaf.it
SUMMARY:Colloquium - Gianluca Castignani: Processing of gas in galaxies within the cosmic web
DESCRIPTION:Galaxies are distributed in a complex filamentary network of matter called the cosmic web. Several studies showed that galaxy properties can be influenced by their large scale environments: spiral galaxies may interact and merge into an elliptical galaxy\, they can be stripped from their gas by ram pressure and see their star formation quenched\, they can be harassed in small groups\, even before entering into clusters. However\, it remains debated which is the overall impact of the cosmic web in processing cold gas of galaxies\, as they move through large-scale filaments around the clusters down to the densest regions of the cluster cores. To evaluate the degree of such processing it is essential to study the reservoirs of molecular gas as it is the raw material from which stars form. I will present the results of a large observational campaign\, mainly exploiting IRAM millimeter facilities\, with the goal of quantifying the processing of galaxies’ gas in the cosmic web and with cosmic time. I will discuss the degree of such processing in a variety of dense megaparsec-scale environments for: i) galaxies in the cosmological filaments around Virgo\, the nearest cluster in the Universe\, ii) galaxies in and around clusters at intermediate redshifts\, iii) distant brightest cluster galaxies (BCGs) at the center of clusters. Finally\, I will discuss the potential of such studies for next generation multi-wavelength facilities. Thousands of distant clusters and BCGs will be detected with Euclid\, enabling an unprecedented leverage to constrain galaxy evolution in clusters.
URL:https://www.oa-roma.inaf.it/event/colloquium-gianluca-castignani/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230328T113000
DTEND;TZID=Europe/Rome:20230328T123000
DTSTAMP:20260404T205326
CREATED:20230210T064046Z
LAST-MODIFIED:20230325T095723Z
UID:11279-1680003000-1680006600@www.oa-roma.inaf.it
SUMMARY:colloquium - Giulia De Somma: The classical Cepheids modelling in the Gaia Era
DESCRIPTION:Classical Cepheids are the most used primary distance indicators to calibrate\nthe cosmic distance ladder and reliable stellar population tracers. These stars\nhave been adopted to probe galactic evolution and star formation\, thanks to\ntheir intrinsic variability and the link between pulsation properties and\nevolutionary parameters. A theoretical approach to the study of these objects\nis crucial to interpret observed behaviors and fully exploiting the accuracy of\nobserved oscillation characteristics in terms of stellar properties and distances.\nBy using the Stellingwerf hydrodynamical code\, we recently provided detailed\nhomogeneous nonlinear Classical Cepheid pulsation models. We take into\naccount variations of chemical composition\, mass-luminosity (ML) relation\, and\nefficiency of super-adiabatic convection.\nThe predicted pulsation observables included the instability strips\, multi-filter\nlight curves\, and the corresponding mean magnitudes and colors.\nWe used these quantities to derive metal-dependent period-luminosity-color\n(PLC) and period-Wesenheit (PW) relations. The latter were applied to a\nsample of Gaia Early Data Release 3 (DR3) Galactic Cepheids. The inferred\ntheoretical parallaxes were tested against Gaia astrometric results. By\ncombining this pulsational scenario with updated stellar evolution\npredictions and using the BASTI code\, we derived new and accurate metal-\ndependent Period-Age and Period-Age-Color relations\, which were applied to\nthe same sample of Galactic Cepheids in the Gaia DR3 to constrain their age\ndistribution. These results are all discussed in view of the incoming SPECTRUM\nproject that will represent the first attempt to systematically compute\nnonlinear convective pulsation models along stellar evolutionary tracks.
URL:https://www.oa-roma.inaf.it/event/colloquium-giulia-de-somma/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230321T113000
DTEND;TZID=Europe/Rome:20230321T123000
DTSTAMP:20260404T205326
CREATED:20230210T063937Z
LAST-MODIFIED:20230313T064314Z
UID:11276-1679398200-1679401800@www.oa-roma.inaf.it
SUMMARY:colloquium - Sonia Fornasier: Latest results on 67P/Churyumov-Gerasimenko comet from the OSIRIS instrument onboard the ROSETTA mission
DESCRIPTION:The Rosetta space mission of the European Space Agency Rosetta has observed comet 67P/Churyumov-Gerasimenko for about 2 years\, delivering the lander Philae on the comet surface for the first time in the history of the space exploration.  Ended in September 2016\, the Rosetta/Philae mission\, acquired an incredible amount of unique data of comet 67P\, allowing the most detailed study ever attempted of a comet.\nRosetta had a large complement of scientific experiments including the OSIRIS imaging system which consists of a Wide Angle Camera (WAC) and a Narrow Angle Camera (NAC). More than 80000 images were acquired with the OSIRIS imaging system with spatial resolution ranging from several meters to a few centimeters per pixel during Rosetta’s descent to the comet in late September 2016.  In particular\, the high dynamics of the cameras detectors permitted to distinguish morphological structures on shadowed areas as well as frost layers\, and to monitor at the same time the very dark surface\, faint jets (with lifetimes shorter than a few minutes)\, and ices exposures.\nAn extensive catalogue of volatiles exposure was recently created permitting to investigate the link between composition\, morphology and activity. It also indicates that ices exposures are typically sub-meter sized\, information which is relevant for cometary models.\nDetailed analysis of highly active regions revealed that the small lobe has different physical and mechanical properties than the big one and a lower volatile content\, at least in its uppermost layers. These findings support the hypothesis that comet 67P originated from the merging of two distinct bodies in the early Solar System\, as previously suggested by the geomorphological analyses of the comet terrains.\nFinally\, the reconstructed Philae orbit revealed that it had a second landing site located only 30 m apart from the final one. Philae stamped within a boulder for 25 cm depth\, indicating that the cometary material is extremely soft and highly porous. This collision exposed the primordial water ice embedded within the boulder\, providing an accurate measurement of the refractory to volatile ratio in comet 67P.
URL:https://www.oa-roma.inaf.it/event/colloquium-sonia-fornasier-3/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230307T113000
DTEND;TZID=Europe/Rome:20230307T123000
DTSTAMP:20260404T205326
CREATED:20230217T061831Z
LAST-MODIFIED:20230223T160230Z
UID:11309-1678188600-1678192200@www.oa-roma.inaf.it
SUMMARY:VVV Microlensing events as tracers of Galactic structure and kinematics
DESCRIPTION:We report the discovery of ~1\,000 microlensing events within an area covering 20.68 deg^2 between 2010 and 2015 in the zero-latitude region of the Galactic bulge using the VVV Survey near-IR data. We used the near-IR Color-Magnitude and Color-Color Diagram to analyze the extinction properties of the sample in the central region of the Galactic plane. We study the Einstein ring crossing time distribution as a strong dark mass indicator and study features of the Galactic structure. We found 20 distant microlensing events probably located in the far disk of the Galaxy. This is the first time a population of events has been discovered\, allowing us to study the other side of the Milky Way. We also examine specific events\, such as the long timescale events showing parallax that favor the presence of dark stellar remnants such as black holes and neutron stars\, which are essential ingredients in our understanding of stellar evolution and mass distribution\, galaxy evolution and structure\, dark matter balance\, etc.
URL:https://www.oa-roma.inaf.it/event/colloquium-gabriela-navarro/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230228T113000
DTEND;TZID=Europe/Rome:20230228T123000
DTSTAMP:20260404T205326
CREATED:20230210T063549Z
LAST-MODIFIED:20230217T063652Z
UID:11272-1677583800-1677587400@www.oa-roma.inaf.it
SUMMARY:Connecting AGN and massive gas reservoir in protoclusters: the Chandra view of the Jackpot nebula at z=2
DESCRIPTION:High-redshift\, gas-rich galaxy protoclusters represent excellent laboratories\nfor investigating the effects of the environment on SMBH growth\, nuclear\nactivity and onset of AGN feedback in overdense regions.\nThe detection of enormous (>200 kpc) Ly_alpha nebulae (ELANe) in some of these\nsystems\, coupled with the presence of multiple AGN\, has called for an extensive\nfollow-up observational campaign\, including X-rays to properly census\nthe AGN population in these protocluster and\, hence\, determine their role in\npowering ELANe.\nIn this talk\, I will present an ongoing large Chandra program targeting some\nhigh-redshift ELANe; in particular\, I will focus on the properties of the\nJackpot nebula at z=2\, showing four X-ray detected AGN in the inner part and\nsome additional AGN associated with Lyman alpha emitters on larger scales.\nI will also report on the detection of diffuse X-ray emission in the inner\nregion of the nebula.
URL:https://www.oa-roma.inaf.it/event/colloquium-cristian-vignali/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20230221T113000
DTEND;TZID=Europe/Rome:20230221T123000
DTSTAMP:20260404T205326
CREATED:20230210T063356Z
LAST-MODIFIED:20230211T123928Z
UID:11269-1676979000-1676982600@www.oa-roma.inaf.it
SUMMARY:The most extreme phase of black holes growth and feedback
DESCRIPTION:Deep surveys have revealed fully-grown supermassive black holes powering active galactic nuclei at very high redshifts\, when the Universe was a few hundred Myr old\, less than 10% of its current age. This challenges the theories of black holes growth\, requiring long periods of high accretion\, most likely above the Eddington limit. These objects will be difficult to study in detail\, even with future advanced observatories. However\, in the nearby Universe\, there are several objects that shine beyond Eddington\, can be studied in great detail and used as proxy for primordial black holes. In the supermassive regime we have some narrow line Seyfert 1 galaxies and tidal disruption events\, whilst hundreds of stellar-mass black holes and neutron stars are known to power ultraluminous X-ray sources (ULXs). A common denominator to these stellar-mass and supermassive objects is the presence of extreme winds which confirm the predictions by theoretical models of super-Eddington accretion. These winds carry a huge amount of power owing to their mildly-relativistic speeds (~0.2c) and are able to significantly affect the surrounding medium and limit the amount of matter that can reach the central accretor. In this seminar I will discuss the state-of-art of super-Eddington accretion in different mass regimes and highlight future missions that will decisively boost this research field.
URL:https://www.oa-roma.inaf.it/event/colloquium-ciro-pinto/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20220125T113000
DTEND;TZID=Europe/Rome:20220125T123000
DTSTAMP:20260404T205326
CREATED:20220119T145638Z
LAST-MODIFIED:20220119T145638Z
UID:10265-1643110200-1643113800@www.oa-roma.inaf.it
SUMMARY:colloquium Anita Zanella: The contribution of high-redshift star-forming regions to galaxy evolution
DESCRIPTION:Observations have shown that local galaxies have modest star formation rates and form the bulk of their stars in giant molecular clouds. In comparison\, galaxies in the early Universe have high star formation rates and host large star-forming regions (dubbed “clumps”)\, 10 – 1000 times larger\, brighter\, and more massive than local giant molecular clouds. Interestingly\, the formation phase of clumps has rarely been observed and their fate is highly uncertain. Are they born in-situ due to fragmentation of gas-rich disks or are they small satellite galaxies that merged with the host? Do they migrate inward and contribute to the formation of the galaxy bulge or are they rapidly disrupted by stellar feedback? Do they play a role in the mass assembly and structural evolution of the host galaxy? I will discuss our latest results derived from spatially-resolved HST\, VLT/MUSE and ALMA datasets\, as well as mock observations created from hydrodynamical simulations\, which provide some answers to these open questions. \n\n\n 
URL:https://www.oa-roma.inaf.it/event/colloquium-anita-zanella-the-contribution-of-high-redshift-star-forming-regions-to-galaxy-evolution/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20210126T113000
DTEND;TZID=Europe/Rome:20210126T123000
DTSTAMP:20260404T205326
CREATED:20201219T111234Z
LAST-MODIFIED:20201219T111234Z
UID:8753-1611660600-1611664200@www.oa-roma.inaf.it
SUMMARY:colloquium - Michele Fabrizio
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-michele-fabrizio/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20210119T113000
DTEND;TZID=Europe/Rome:20210119T123000
DTSTAMP:20260404T205326
CREATED:20201219T111134Z
LAST-MODIFIED:20201219T111134Z
UID:8751-1611055800-1611059400@www.oa-roma.inaf.it
SUMMARY:colloquium - Flavia Dell'Agli
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-flavia-dellagli-2/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20210113T113000
DTEND;TZID=Europe/Rome:20210113T123000
DTSTAMP:20260404T205326
CREATED:20201219T105808Z
LAST-MODIFIED:20201219T110954Z
UID:8749-1610537400-1610541000@www.oa-roma.inaf.it
SUMMARY:The X-ray rise of primeval titans: HYPerluminous quasars at the Epoch of ReionizatION (HYPERION)
DESCRIPTION:The outstanding mass growth of the Supermassive Black Holes powering\nluminous quasars at the Epoch of Reionization (EoR\, z > 6) is one of\nthe most debated open problems of modern extragalactic\nastrophysics. These quasars are current targets of extensive\nmultiwavelength campaigns with todays flagship observatories\, in order\nto understand their properties. The limited sensitivity of current\nX-ray observatories\, however\, has so far provided mostly low quality\nspectra (< 10 − 15 counts; 0.5-10 keV) and therefore a poor\ncharacterization of their nuclear properties. I will present HYPERION\,\na 2.4 Ms Multi-Year Heritage XMM programme on the titans among z = 6 −\n7.5 quasars (i.e. the most luminous/massive at their epoch) designed\nto dramatically improve the X-ray data quality to 100 counts for a\nsample of 15 sources. HYPERION will deliver unprecedented constraints\non their nuclear properties\, accretion\, ejection\, disc/corona complex\,\nand\, while perfectly complementing observations at other wavelengths\,\nwill enable X-ray spectroscopic population studies at EoR to begin.
URL:https://www.oa-roma.inaf.it/event/the-x-ray-rise-of-primeval-titans-hyperluminous-quasars-at-the-epoch-of-reionization-hyperion/
LOCATION:RM
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200505T114500
DTEND;TZID=Europe/Rome:20200505T124500
DTSTAMP:20260404T205326
CREATED:20191031T060837Z
LAST-MODIFIED:20200121T150815Z
UID:7034-1588679100-1588682700@www.oa-roma.inaf.it
SUMMARY:colloquium - Hans Van Winckel
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-hans-van-winckel/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200428T114500
DTEND;TZID=Europe/Rome:20200428T124500
DTSTAMP:20260404T205326
CREATED:20200131T083054Z
LAST-MODIFIED:20200131T163718Z
UID:7374-1588074300-1588077900@www.oa-roma.inaf.it
SUMMARY:colloquium - Suzanne Ramsey
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-suzan-ramsey/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200420T114500
DTEND;TZID=Europe/Rome:20200420T124500
DTSTAMP:20260404T205326
CREATED:20191211T154418Z
LAST-MODIFIED:20200113T110038Z
UID:7208-1587383100-1587386700@www.oa-roma.inaf.it
SUMMARY:colloquium - Giovanni Miniutti
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-giovanni-miniutti/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200407T114500
DTEND;TZID=Europe/Rome:20200407T124500
DTSTAMP:20260404T205326
CREATED:20191113T105052Z
LAST-MODIFIED:20191113T105052Z
UID:7085-1586259900-1586263500@www.oa-roma.inaf.it
SUMMARY:colloquium - Matt Middleton
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-matt-middleton/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200324T114500
DTEND;TZID=Europe/Rome:20200324T124500
DTSTAMP:20260404T205326
CREATED:20200117T082551Z
LAST-MODIFIED:20200117T082551Z
UID:7290-1585050300-1585053900@www.oa-roma.inaf.it
SUMMARY:colloquium - Eleonora Fiorellino
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-eleonora-fiorellino/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200317T114500
DTEND;TZID=Europe/Rome:20200317T124500
DTSTAMP:20260404T205326
CREATED:20200110T123928Z
LAST-MODIFIED:20200110T123928Z
UID:7272-1584445500-1584449100@www.oa-roma.inaf.it
SUMMARY:colloquium - Brian Chaboyer
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-brian-chaboyer/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200310T114500
DTEND;TZID=Europe/Rome:20200310T124500
DTSTAMP:20260404T205326
CREATED:20200121T150505Z
LAST-MODIFIED:20200121T150505Z
UID:7311-1583840700-1583844300@www.oa-roma.inaf.it
SUMMARY:The role of starburst galaxies and mergers in the distant Universe
DESCRIPTION:Starburst galaxies are the most luminous star-forming powered objects in the Universe. A long standing problem in galaxy evolution is to understand whether these systems are caused by merger events\, or they are just gas rich galaxies undergoing stochastic accretion events. To properly characterize them\, we need infrared data\, given the huge dust attenuations affecting their UV and optical emission. \nI will present a unique set of near-infrared rest-frame spectral observations of star-forming galaxies at redshift ~ 0.7\, and show how these can be used to understand the dust properties and origin of starbursts. Furthermore\, I will explain how additional multiwavelength information (from radio to X-rays) is crucial to trace the whole sequence of mergers\, test the merger-AGN connection and the formation mechanism of passive galaxies. Finally\, I will exploit high-resolution HST images to investigate the role of mergers on the origin of bright star-forming clumps in high-redshift galaxies. A complete study of near-infrared rest-frame lines will allow JWST to probe the physical properties (e.g.\, dust attenuation\, metallicity) and the nature of the most dust-embedded systems up to the reionization epoch.
URL:https://www.oa-roma.inaf.it/event/the-role-of-starburst-galaxies-and-mergers-in-the-distant-universe/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200303T114500
DTEND;TZID=Europe/Rome:20200303T124500
DTSTAMP:20260404T205326
CREATED:20200117T082906Z
LAST-MODIFIED:20200117T082906Z
UID:7292-1583235900-1583239500@www.oa-roma.inaf.it
SUMMARY:colloquium - Ester Marini
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-ester-marini/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200228T114500
DTEND;TZID=Europe/Rome:20200228T124500
DTSTAMP:20260404T205326
CREATED:20191016T143241Z
LAST-MODIFIED:20200127T143943Z
UID:6932-1582890300-1582893900@www.oa-roma.inaf.it
SUMMARY:colloquium - Roberta Zanin
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-roberta-zanin/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20200218T114500
DTEND;TZID=Europe/Rome:20200218T124500
DTSTAMP:20260404T205326
CREATED:20190723T115244Z
LAST-MODIFIED:20200207T102810Z
UID:6539-1582026300-1582029900@www.oa-roma.inaf.it
SUMMARY:The interstellar medium at high redshift
DESCRIPTION:The gaseous content of galaxies is one of the key ingredients of galaxy evolution: It fuels star formation and nuclear activity\, and at the same time it is the main receiver of any feedback mechanism from these two processes. However\, we have only very limited knowledge of the gas content and of its physical properties in galaxies beyond the local universe. As a result\, no description of galaxy formation can be fully validated without a better understanding of 1) how much gas was available for star formation in different cosmic times; 2) how the star formation efficiency\, i.e.\, the capability of a galaxy to form stars from a given amount of gas\, evolve through cosmic history\, and which are physical conditions that governed this evolution; 3) what was the interplay between the interstellar medium\, star formation\, and nuclear activity. These questions are particularly critical at the very high redshifts (z>6\, when the universe was <1 Gyr old)\, where our census of galaxies is highly incomplete\, especially at the high-mass end\, and galaxies followed very different evolution according to the mass of their initial gas reservoir. In this talk I will present the results of various observational campaigns aimed at addressing these questions\, in particular by capitalizing on the unprecedented capabilities offered by the Atacama Large Millimeter Array and the Northern Extended Millimeter Array. These findings will guide the next generation of simulations and theoretical models\, thus marking a transformational step in our understanding of galaxy evolution.
URL:https://www.oa-roma.inaf.it/event/roberto-de-carli-colloquium/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
END:VCALENDAR