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X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
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DTSTART:20180325T010000
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DTSTART:20181028T010000
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DTSTART:20190331T010000
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DTSTART:20191027T010000
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DTSTART:20200329T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191029T114500
DTEND;TZID=Europe/Rome:20191029T124500
DTSTAMP:20260404T221149
CREATED:20191020T043613Z
LAST-MODIFIED:20191020T043613Z
UID:6990-1572349500-1572353100@www.oa-roma.inaf.it
SUMMARY:Post-AGB stars as tracers of the origin of elements in the Universe
DESCRIPTION:The chemical evolution of galaxies is governed by the chemical yields from stars\, especially from Asymptotic Giant Branch (AGB) stars. This underlines the importance of understanding how AGB stars produce their elements by obtaining accurate stellar nucleosynthetic yields. Although AGB nucleosynthesis has general validity\, critical uncertainties (such as the treatment of convective-driven mixing processes and mass loss) exist in current stellar models. Observations from Post-Asymptotic Giant Branch (post-AGB) stars serve as excellent tools to confront predictions from a dedicated suite of stellar models\, quantify the strongest discrepancies\, and eliminate crucial uncertainties that hamper stellar modelling. Our recent studies of post-AGB stars have shown an intriguing chemical diversity that ranges from stars that are extremely enriched in carbon and s-process elements to the discovery of the first post-AGB star with no traces of carbon nor s-process elements. Additionally\, our studies have also shown that AGB nucleosynthesis is significantly affected by a binary companion. These results reflect the complexity that surrounds the element production in AGB stars. In this talk\, I will present the intriguing chemical diversity observed in post-AGB stars and its implications on element/isotope production in AGB stars and stellar nucleosynthetic yields.
URL:https://www.oa-roma.inaf.it/event/post-agb-stars-as-tracers-of-the-origin-of-elements-in-the-universe/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191022T114500
DTEND;TZID=Europe/Rome:20191022T124500
DTSTAMP:20260404T221149
CREATED:20191007T104849Z
LAST-MODIFIED:20191008T082548Z
UID:6886-1571744700-1571748300@www.oa-roma.inaf.it
SUMMARY:Linear spectropolarimetry in stars different than the Sun: what can we learn?
DESCRIPTION:Polarimetry is considered as an important searching tool in Astronomy and it deserves to be a standard observational technique for a variety of astrophysical contexts: from stellar photospheric inhomogeneities to protoplanetary nebulae\, as well as in the exoplanet research field. Despite this\, however\, the difficulties involved in the measurements and in the theoretical interpretation made this technique not as widespread as it deserves. In this talk I will review the results of my research about the diagnostic potential of optical high resolution linear spectropolarimetry in stars different than the Sun.  At this purpose\, after an introduction on the observational technique\, I will focus on the polarised spectrum of the post-AGB binary system 89 Herculis: from the very inner regions of the stellar envelope to the first observational evidence of a micro-Gauss level magnetic field. Finally\, I will discuss on the applicability and future prospect of this technique in the more general context of stellar physics.
URL:https://www.oa-roma.inaf.it/event/colloquium-manuele-ganci/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191015T114500
DTEND;TZID=Europe/Rome:20191015T134500
DTSTAMP:20260404T221149
CREATED:20190913T082524Z
LAST-MODIFIED:20191008T061431Z
UID:6725-1571139900-1571147100@www.oa-roma.inaf.it
SUMMARY:Horizontal Branch morphologies in the age of multi-band photometry
DESCRIPTION:The Horizontal Branch (HB) stars have always played a crucial role in the study of the galactic globular clusters (GC). They are the direct offspring of the low mass\, Red Giant Branch (RGB) stars and the final product of the helium flash taking place at the Tip of the RGB. The colour and the luminosity of a HB star are tied to its mass which\, in turn\, is tied to the mass of the star undergoing the flash. The sensitivity of this value to the chemistry of the cluster allows for a large variety of HB morphologies which is one of the culprits that led to the discovery of the multiple populations phenomenon. A leap forward in our understanding of GCs has been made when recent works\, based on a large collection of HST data\, measured\, albeit indirectly\, the helium abundance in a large collection of GCs\, allowing the characterization of these old stellar populations in unprecedented ways. In spite of this richness of information\, however\, we still lack the key to fully understand the populations hosted along the HB\, especially due to the complex interplay between the parameters regulating their evolution. In this talk\, I will provide a review of the current state of the HB study and discuss how the synergy with the recent advancements in the field of multi-band photometry can provide solutions to some new and decades-old problems.
URL:https://www.oa-roma.inaf.it/event/colloquium-marco-tailo/
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191010T114500
DTEND;TZID=Europe/Rome:20191010T124500
DTSTAMP:20260404T221149
CREATED:20191004T065258Z
LAST-MODIFIED:20191004T065258Z
UID:6873-1570707900-1570711500@www.oa-roma.inaf.it
SUMMARY:Dynamic relations in sampled processes
DESCRIPTION:I will start my talk by a short description of a historical connection between my university\, Shanghai Jiao Tong University (SJTU)\, and Collegio Romano. There is an interesting chain from Clavius\, who led the Gregorian calendar reform\, via Matteo Ricci and Xu Guangqi\, the first modern scientist of China\, to the founding of the two elite universities on Shanghai\, Fudan and SJTU. The technical part of my talk is based on joint work with Tryphon Georgiou. Linear dynamical relations that may exist in continuous-time\, or at some natural sampling rate\, are not directly discernable at reduced observational sampling rates. Indeed\, at reduced rates\, matrix-valued spectral densities of vector-valued time series have maximal rank and thereby cannot be used to ascertain potential dynamic relations between their entries. This hitherto undeclared source of inaccuracies appears to plague off-the-shelf identification techniques seeking remedy in hypothetical observational noise. In this paper we explain the exact relation between stochastic models at different sampling rates and show how to construct stochastic models at the finest time scale that data allows. We then point out that the correct number of dynamical dependences can only be ascertained by considering stochastic models at this finest time scale\, which in general is faster than the observational sampling rate.
URL:https://www.oa-roma.inaf.it/event/dynamic-relations-in-sampled-processes/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191003T114500
DTEND;TZID=Europe/Rome:20191003T124500
DTSTAMP:20260404T221149
CREATED:20190902T141633Z
LAST-MODIFIED:20190926T090644Z
UID:6683-1570103100-1570106700@www.oa-roma.inaf.it
SUMMARY:Early galaxy formation and its large-scale effects
DESCRIPTION:Galaxy formation in the first billion years mark a time of great upheaval in the history of the Universe: as the first sources of light\, these galaxies ended the ‘cosmic dark ages’ and produced the first photons that could break apart the hydrogen atoms suffusing all of space starting the process of cosmic reionization. As the earliest building blocks\, the galaxies that formed in the first billion years also determine the physical properties of all subsequent galaxy populations. I will start by introducing the reionization process and detail the reasons foe which the history and topology of reionization remain debated. I will then show how cross-correlations of 21cm data with the underlying galaxy population\, in the forthcoming era of 21cm cosmology\, will yield tantalising constraints on the average intergalactic medium ionization state as well as the reionization toplogy (outside-in versus inside-out). Time permitting\, I will try to give a flavour of how the assembly of early galaxies\, accessible with the forthcoming James Webb Space Telescope\, can provide a powerful testbed for Dark Matter models beyond “Cold Dark Matter”.
URL:https://www.oa-roma.inaf.it/event/colloquium-pratika-dayal/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20191001T114500
DTEND;TZID=Europe/Rome:20191001T124500
DTSTAMP:20260404T221149
CREATED:20190612T065612Z
LAST-MODIFIED:20190612T065612Z
UID:6287-1569930300-1569933900@www.oa-roma.inaf.it
SUMMARY:colloquium - Chris Sneden
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-chris-sneden/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190926T114500
DTEND;TZID=Europe/Rome:20190926T124500
DTSTAMP:20260404T221149
CREATED:20190612T065845Z
LAST-MODIFIED:20190925T064343Z
UID:6291-1569498300-1569501900@www.oa-roma.inaf.it
SUMMARY:Modeling stellar winds on the asymptotic giant branch accurately
DESCRIPTION:I present the latest progress on our ongoing work with our state-of-the-art\nmodels of stellar winds of asymptotic giant branch stars. I will both depict\nfeatures and assumptions of our model code T-800 and show some of the results\nthat set our work apart; because\, results are in several a case drastically\ndifferent from earlier results. In particular\, I focus on effects of\ngas-to-dust drift and higher-than-before spatial resolution.
URL:https://www.oa-roma.inaf.it/event/chris-sandin-colloquium/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190924T143000
DTEND;TZID=Europe/Rome:20190924T153000
DTSTAMP:20260404T221149
CREATED:20190612T065744Z
LAST-MODIFIED:20190913T070536Z
UID:6289-1569335400-1569339000@www.oa-roma.inaf.it
SUMMARY:Lars Mattsson - colloquium
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/lars-mattsson-colloquium/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190916T114500
DTEND;TZID=Europe/Rome:20190916T124500
DTSTAMP:20260404T221149
CREATED:20190730T120235Z
LAST-MODIFIED:20190910T150513Z
UID:6567-1568634300-1568637900@www.oa-roma.inaf.it
SUMMARY:Absorption and accretion properties of local Active Galactic Nuclei
DESCRIPTION:Active Galactic Nuclei (AGN) are powered by accretion onto supermassive black holes and\, besides being among the most luminous sources of radiation in the Universe\, are also widely believed to play an important role in the evolution of their host galaxies.\nX-ray emission is an ubiquitous property of AGN and\, being produced within a few gravitational radii from the supermassive black hole\, can provide fundamental information about the structure and geometry of the circumnuclear material\, as well as on the characteristics of the accretion flow. In my talk I will present recent studies of the obscuration and accretion properties of local AGN in the X-ray band\, focussing on the results obtained from the Swift/BAT AGN Spectroscopic Survey. \n 
URL:https://www.oa-roma.inaf.it/event/colloquium-claudio-ricci/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190625T114500
DTEND;TZID=Europe/Rome:20190625T124500
DTSTAMP:20260404T221149
CREATED:20181130T090752Z
LAST-MODIFIED:20190522T150749Z
UID:5043-1561463100-1561466700@www.oa-roma.inaf.it
SUMMARY:Unravelling the Andromeda Galaxy's most important merger
DESCRIPTION:The Andromeda Galaxy (M31)\, our nearest large galactic neighbour\, offers a unique opportunity to test how mergers affect galaxy properties. M31’s stellar halo caused by the tidal disruption of satellite galaxies is the best tracer of the galaxy’s accretion history. Despite a decade of effort in mapping out M31’s large stellar halo\, we are unable to convert M31’s stellar halo into a merger history. Here we use cosmological models of galaxy formation to show that M31’s massive and metal-rich stellar halo containing intermediate age stars implies that it merged with a large (M* ~ 2.5 x 10^10 M_sun) galaxy ~2 Gyr ago. The simulated properties of the merger debris help to interpret a broader set of observations of M31’s stellar halo and satellites than previously considered: its compact and metal-rich satellite M32 is the tidally-stripped core of the disrupted galaxy\, M31’s rotating and flattened inner stellar halo contains most of the merger\ndebris\, and the giant stellar stream is likely to have been thrown out during the merger. This accreted galaxy was the third largest member of the Local Group. This merger may explain the global burst of star formation ~2 Gyr ago in the disk of M31 in which ~1/5 of its stars were formed. Moreover\, M31’s disk and bulge were already in place before its most important merger\, suggesting that mergers of this magnitude do not dramatically affect galaxy structure.
URL:https://www.oa-roma.inaf.it/event/colloquium-alessio-marino/
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190618T114500
DTEND;TZID=Europe/Rome:20190618T124500
DTSTAMP:20260404T221149
CREATED:20190222T092344Z
LAST-MODIFIED:20190531T163519Z
UID:5490-1560858300-1560861900@www.oa-roma.inaf.it
SUMMARY:The eye of Gaia on globular clusters dynamics
DESCRIPTION:I present the results of a survey of the kinematics of a large sample of Galactic globular clusters performed thanks to the synergy between the 2nd Gaia data release and the most extensive collection of radial velocities. This unprecedented dataset of 3D velocities of thousand of stars in more than 100 globular clusters has been used to investigate both the internal (masses\, anisotropy and rotation patterns) and the systemic dynamics (orbits\, tides) of these stellar systems providing also insight into the overall structure of the Galactic globular cluster system.
URL:https://www.oa-roma.inaf.it/event/colloquium-antonio-sollima/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190613T114500
DTEND;TZID=Europe/Rome:20190613T124500
DTSTAMP:20260404T221149
CREATED:20190405T105451Z
LAST-MODIFIED:20190408T052554Z
UID:5898-1560426300-1560429900@www.oa-roma.inaf.it
SUMMARY:Probing Dark Matter and Dark Energy with strong gravitational lensing
DESCRIPTION:Evidence from different cosmological probes have lead to the establishment of the dark matter and dark energy paradigm. Dark matter dominates the matter budget at cosmological scales and drives the formation of structure and dark energy is responsible for the late time acceleration of the universe. To date\, these phenomenas have purely been described as gravitational effects and no other evidence have provided convincing evidence for their underlying physical nature – remaining one of the most striking mysteries the universe has not yet revealed.\nIn my talk\, I will describe the phenomena of strong gravitational lensing and how we can use this unique probe to constrain the physical nature of dark matter and dark energy. I am going to highlight recent results in both domains. I will then look in the near future and highlight the prospects of this technique with increasing sample size\, analysis techniques and instrumentation.
URL:https://www.oa-roma.inaf.it/event/simon-birrer-colloquium/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190611T114500
DTEND;TZID=Europe/Rome:20190611T124500
DTSTAMP:20260404T221149
CREATED:20190328T073046Z
LAST-MODIFIED:20190328T073046Z
UID:5792-1560253500-1560257100@www.oa-roma.inaf.it
SUMMARY:Orlando Luongo - colloquium
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/orlando-luongo-colloquium/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190528T114500
DTEND;TZID=Europe/Rome:20190528T124500
DTSTAMP:20260404T221149
CREATED:20190220T133740Z
LAST-MODIFIED:20190506T221609Z
UID:5473-1559043900-1559047500@www.oa-roma.inaf.it
SUMMARY:Protoclusters of galaxies: from Planck to the Euclid and JWST era
DESCRIPTION:Clusters of galaxies are key structures for our understanding of galaxy\nevolution physics in denser environments\, for constraining the structure\nformation scenario and some cosmological parameters independantly of\nother techniques like CMB. Despite the difficulties to observe\, detect\nand model them\, there are successes in studying and using galaxy\nclusters. In the recent years\, many hight-redshift galaxy clusters (z>1)\nwere detected as well as many high-redshift protoclusters (z>1.5)\,\nprogenitors of todays’s clusters. These objects help answering crucial\nquestions like how and when the clusters formed stars ? In a\nsynchroneous way ? What is the fate of the gas in clusters ? \nAfter a review of the current status of protoclusters search and\nproperties and the latest results\, I will focus on the original program\nwe are performing with Planck\, Herschel\, Spitzer\, IRAM\, ALMA and other\nfacilities. \nWe selected an original sample of about 2000 highly star-forming\nstructures candidates in Planck\, deep in the Cosmic Infrared Background.\nSelection was not done in SZ\, but by colors of the redshifted peak of\nthermal far-infrared emission of galaxies. We observed about 200 of them\nwith Herschel/SPIRE\, about 80 of them with Spitzer/IRAC\, and about a\ndozen in the near-infrared and millimeter ranges. We have a few redshift\nconfirmations\, and I will highlight our main findings\, work in progress\,\nand perspectives of the SPHerIC subsample (Spitzer\, Planck\, Herschel\ninfrared clusters). \nA colleague said wisely about high-redshift clusters and protoclusters\nin a review talk\, « we need more than one object at a time. » Euclid and\nJWST will make evolve this field (and other) after 2021 with increasing\nstatistics and a sharp\, detailed view of these structures at the\n« cosmic noon » epoch and earlier.
URL:https://www.oa-roma.inaf.it/event/colloquium-herve-dole/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190521T114500
DTEND;TZID=Europe/Rome:20190521T124500
DTSTAMP:20260404T221149
CREATED:20190304T101823Z
LAST-MODIFIED:20190506T221827Z
UID:5532-1558439100-1558442700@www.oa-roma.inaf.it
SUMMARY:The first image of a black hole
DESCRIPTION:I will briefly discuss how the first image of a black hole was obtained\nby the EHT collaboration. In particular\, I will describe the theoretical\naspects that have allowed us to model the dynamics of the plasma\naccreting onto the black hole and how such dynamics was used to generate\nsynthetic black-hole images. I will also illustrate how the comparison\nbetween the theoretical images and the observations has allowed us to\ndeduce the presence of a black hole in M87 and to extract information\nabout its properties. Finally\, I will describe the lessons we have\nlearned about strong-field gravity and alternatives to black holes.
URL:https://www.oa-roma.inaf.it/event/colloquium-valentina-dorazi/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190514T114500
DTEND;TZID=Europe/Rome:20190514T124500
DTSTAMP:20260404T221149
CREATED:20180725T070555Z
LAST-MODIFIED:20180725T070555Z
UID:4176-1557834300-1557837900@www.oa-roma.inaf.it
SUMMARY:colloquium - Francoise Combes
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-francoise-combes/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190514T114500
DTEND;TZID=Europe/Rome:20190514T124500
DTSTAMP:20260404T221149
CREATED:20180725T070555Z
LAST-MODIFIED:20190502T064008Z
UID:4759-1557834300-1557837900@www.oa-roma.inaf.it
SUMMARY:Molecular tori\, black hole fueling and feedback in nearby AGN
DESCRIPTION:Recent molecular line observations with ALMA in several nearby Seyferts have revealed the existence of molecular tori\, and the nature of gas flows at 10-20pc scale. At 100pc scale\, or kpc-scale\, previous work on gravitational torques had shown that only about one third of Seyfert galaxies experienced molecular inflow and central fueling\, while in most cases the gas was stalled in rings. At higher resolution\, i.e. 10-20pc scale\, it is possible now to see in some cases AGN fueling due to nuclear trailing spirals\, influenced by the black hole potential. This brings smoking gun evidence for nuclear fueling. In our sample galaxies\, the angular resolution of up to 80mas allows us to reach the BH-zone of influence and the BH mass can be derived more directly than with the M-sigma relation.
URL:https://www.oa-roma.inaf.it/event/colloquium-francoise-combes-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190507T114500
DTEND;TZID=Europe/Rome:20190507T124500
DTSTAMP:20260404T221149
CREATED:20180725T070642Z
LAST-MODIFIED:20180725T070642Z
UID:4178-1557229500-1557233100@www.oa-roma.inaf.it
SUMMARY:colloquium - Mauro Centrone
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-mauro-centrone/
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190416T114500
DTEND;TZID=Europe/Rome:20190416T124500
DTSTAMP:20260404T221149
CREATED:20190111T094223Z
LAST-MODIFIED:20190408T153611Z
UID:5149-1555415100-1555418700@www.oa-roma.inaf.it
SUMMARY:Lithium Web in astrophysics: insights and problems
DESCRIPTION:Lithium (Li) is widely used as a test of the cosmological model\, a probe of stellar structure\, and an age indicator of young stellar clusters. It is the very element that presents deep insights\, yet many problems to astrophysics.\nI will discuss problems and puzzles that Li introduces in astrophysics\, including cosmological Li problem (and a stellar solution to it)\, Li-rich giants problem (Galactic and extraGalactic)\, Li problem in the Sun\, the Galactic Li evolution (in the thin and thick discs)\, and the interstellar Li content. \n 
URL:https://www.oa-roma.inaf.it/event/colloquium-xiaoting-fu/
LOCATION:OAR Monte Porzio Catone – aula Gratton\, Via Frascati 33\, Roma\, RM\, 00136\, Italia
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190409T114500
DTEND;TZID=Europe/Rome:20190409T124500
DTSTAMP:20260404T221149
CREATED:20190111T092938Z
LAST-MODIFIED:20190403T123956Z
UID:5146-1554810300-1554813900@www.oa-roma.inaf.it
SUMMARY:A MUSE view of the multiple populations' chemistry in Galactic Globular Clusters
DESCRIPTION:Stars in Galactic globular clusters are known to exhibit abundance variations in specific elements such as He\, C\, N\, O\, Na\, and Al. These variations can be observed via spectroscopy but also photometrically by using CMD constructed with various filter combinations. Although these multiple populations have been\, and still are\, the subject of many investigations\, the origin of their elemental abundance variations remain rather mysterious.\nI will present some of our recent results on that topic based on the spectroscopic survey of 26 globular clusters that is currently carried out as part of the MUSE GTO time. With the MUSE survey covering the central regions of the clusters for which HST photometry is available\, we can use these photometric catalogs to separate the RGB stars into two or more populations based on their position in the pseudo-two-color diagrams. Although the MUSE spectra are of relatively low-resolution (R ~ 2500)\, by combining the spectra of the stars within a distinct populations\, we are able to study their abundance variations and relate them directly with the populations distinguished on the pseudo-two-color diagrams.
URL:https://www.oa-roma.inaf.it/event/talk-by-marylin-latour/
LOCATION:OAR Monte Porzio Catone – aula Gratton\, Via Frascati 33\, Roma\, RM\, 00136\, Italia
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190326T114500
DTEND;TZID=Europe/Rome:20190326T124500
DTSTAMP:20260404T221149
CREATED:20181008T060951Z
LAST-MODIFIED:20181008T060951Z
UID:4432-1553600700-1553604300@www.oa-roma.inaf.it
SUMMARY:colloquium - Elena Valenti
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-elena-valenti/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190319T114500
DTEND;TZID=Europe/Rome:20190319T124500
DTSTAMP:20260404T221149
CREATED:20181109T150936Z
LAST-MODIFIED:20190318T090252Z
UID:4950-1552995900-1552999500@www.oa-roma.inaf.it
SUMMARY:How quasars affect the formation of the bright cluster galaxy and the circum-galactic medium
DESCRIPTION:AGN activity is considered a fundamental phase of the evolution of the massive galaxies. The accretion onto a SMBH generates a great amount of energy in the form of radiation\, outflows and radio jets that affects both the ISM and CGM. In this talk\, I present the results of two multi-wavelength studies aimed at exploring how nuclear activity affect the formation of the bright cluster galaxy and the circum-galactic medium at high redshift. Firstly\, I will report on the multi-band analysis of the galaxy population in the very dense core (~70 x 70 kpc^2) of one of the most massive galaxy clusters at z ~ 1.6. We are able to shed light on the early\, poorly-explored phase of the assembly of the Brightness Cluster Galaxy (BCG) in a region with high AGN and merger activity.\nI will also report on the properties of both an extended (150 kpc) and luminous (10^44 erg/s) Lya nebula and the associated CIV extended (70 kpc) emission around a hyper-luminous quasar at z~3.6. Our analysis of kinematics of the Lya nebula suggests the presence of a spatially coherent blueshifted (~1000 km/s) component on several tens of kpc scales which we interpret as one of the first indications of an AGN-driven outflow propagating on circum-galactic scales.
URL:https://www.oa-roma.inaf.it/event/colloquium-andrea-travascio/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190314T114500
DTEND;TZID=Europe/Rome:20190314T124500
DTSTAMP:20260404T221149
CREATED:20190111T175301Z
LAST-MODIFIED:20190211T095351Z
UID:5165-1552563900-1552567500@www.oa-roma.inaf.it
SUMMARY:Neutrinos from a blazar jet and the birth of non-stellar neutrino astronomy
DESCRIPTION:IceCube has recently reported the discovery of high-energy neutrinos of astrophysical origin\,\nopening up the PeV (10^15 eV) sky. These observations are challenging to interpret on the\nastronomical side and have triggered a fruitful collaboration across particle and astro-physics.\nI will discuss the very recent association between high-energy IceCube neutrinos and the\nblazar TXS 0506+056\, reporting on how this result fits with the work done by our group over\nthe past five years. I will then present the “big picture”\, explain why this this association is\nvery important for astronomy\, and discuss some very recent results on the nature of TXS 0506+056.\nThe talk is self-contained\, requires no previous knowledge of neutrinos or blazars\, and has been\nprepared for a very broad audience.
URL:https://www.oa-roma.inaf.it/event/colloquium-paolo-padovani/
LOCATION:OAR Monte Porzio Catone – aula Gratton\, Via Frascati 33\, Roma\, RM\, 00136\, Italia
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190312T114500
DTEND;TZID=Europe/Rome:20190312T124500
DTSTAMP:20260404T221149
CREATED:20180725T070413Z
LAST-MODIFIED:20180725T070413Z
UID:4174-1552391100-1552394700@www.oa-roma.inaf.it
SUMMARY:colloquium - Roberto Speziali
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-roberto-speziali/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190312T114500
DTEND;TZID=Europe/Rome:20190312T124500
DTSTAMP:20260404T221149
CREATED:20180725T070413Z
LAST-MODIFIED:20190226T062537Z
UID:4758-1552391100-1552394700@www.oa-roma.inaf.it
SUMMARY:LBT - Italia
DESCRIPTION:LBT – ITALIA è un’organizzazione formata da un team di ricercatori dell’INAF che ha come obiettivo la gestione delle osservazioni al LARGE BINOCULAR TELESCOPE. A distanza di sette anni dall’inizio delle operazioni\, si fornirà una panoramica della strumentazione e si descriverà l’attività del gruppo illustrando i risultati ottenuti.\nAl termine del seminario\, ampio spazio verrà dato alla discussione al fine di ricevere feddback da parte degli utenti\nche hanno già usufruito dei servizi di LBT-ITALIA e rispondere alle domande in vista della imminente apertura della call 2019-2020.
URL:https://www.oa-roma.inaf.it/event/colloquium-roberto-speziali-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190305T114500
DTEND;TZID=Europe/Rome:20190305T124500
DTSTAMP:20260404T221149
CREATED:20180728T055834Z
LAST-MODIFIED:20180728T055834Z
UID:4271-1551786300-1551789900@www.oa-roma.inaf.it
SUMMARY:colloquium - Francesco Massaro
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-francescao-massaro/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190305T114500
DTEND;TZID=Europe/Rome:20190305T124500
DTSTAMP:20260404T221149
CREATED:20180728T055834Z
LAST-MODIFIED:20190223T062348Z
UID:4761-1551786300-1551789900@www.oa-roma.inaf.it
SUMMARY:Flipping a fair coin to decipher the large-scale environment of radio galaxies
DESCRIPTION:The role played by the large-scale environment in the nuclear activity of radio galaxies  is still not completely understood. Accretion mode\, jet power\, and galaxy evolution are connected with their large-scale environment on scales from tens to hundreds of kiloparsecs. I am presenting a detailed statistical analysis of the large-scale environment for two samples of radio galaxies in the local Universe (i.e.\, up to redshift 0.15).\nI will discuss on a direct search of galaxy-rich environments around radio galaxies by using them as beacons. To carry out this study a new method\, that does not appear to suffer cosmological biases and artifacts\, as other algorithms\, was developed. I conclude that\, despite their radio morphological classification (FRI versus FRII) and/or their optical classification (high- or low-excitation radio galaxy\, i.e.\, HERG or LERG)\, radio galaxies in the local universe tend to live in galaxy-rich large-scale environments that have similar characteristics and richness. I will then show that properties of large-scale environments of both FRIs and FRIIs do not depend by the property of central radio galaxy. Finally\, I will provide an estimate of the X-ray parameters that can be derived from optical observations to plan future follow up campaigns.
URL:https://www.oa-roma.inaf.it/event/colloquium-francescao-massaro-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190226T114500
DTEND;TZID=Europe/Rome:20190226T124500
DTSTAMP:20260404T221149
CREATED:20181105T103706Z
LAST-MODIFIED:20190219T062329Z
UID:4807-1551181500-1551185100@www.oa-roma.inaf.it
SUMMARY:When the going get tough... or: observation and laboratory work for life searching in other worlds
DESCRIPTION:“…if we never search\, the chance of success is zero”. This was the conclusion in the seminal paper of G. Cocconi and P. Morrison in 1959 about the search for life. Since then\, a lot of progress in technology and a lot of exciting results in astrophysics have been reached. Today\, we know that\, out of there\, there are more than 4000 new worlds showing a large diversity in their size and orbital characteristics. In the midst of all these strange new worlds\, a very promising type of them\, the super Earths\, seems to be ubiquitous in the Galaxy. Moreover\, in fashion there are super Earths orbiting M stars. But\, such an odd couple could host life? And if it can\, how to find it?
URL:https://www.oa-roma.inaf.it/event/colloquium-sandeep-haridasu/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190219T114500
DTEND;TZID=Europe/Rome:20190219T124500
DTSTAMP:20260404T221149
CREATED:20180907T101417Z
LAST-MODIFIED:20180907T101417Z
UID:4371-1550576700-1550580300@www.oa-roma.inaf.it
SUMMARY:colloquium - Guido De Marchi
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-by-guido-de-marchi/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190219T114500
DTEND;TZID=Europe/Rome:20190219T124500
DTSTAMP:20260404T221149
CREATED:20180907T101417Z
LAST-MODIFIED:20190118T055424Z
UID:4767-1550576700-1550580300@www.oa-roma.inaf.it
SUMMARY:Star formation in the Local Group
DESCRIPTION:Using Hubble Space Telescope (HST) observations\, we have identified and\ncharacterised almost 50\,000 pre-main sequence (PMS) stars in several\nstar-forming regions in the Milky Way and Magellanic Clouds. These objects\nare still undergoing active mass accretion\, as revealed by excess emission\nin the Halpha band. Detailed knowledge of the extinction law in these\nfields\, which we derive directly from the observations\, allows us to\naccurately obtain stellar physical parameters (temperature\, luminosity\,\nage\, mass\, and mass accretion rate). This is presently the largest and\nmost homogeneous sample of PMS objects\, on which we are conducting the\nfirst comprehensive and systematic study of the PMS phase\, spanning a wide\nrange of masses (0.5-4 Msun)\, metallicities (0.1-1 Zsun) and ages (0.5-30\nMyr). \nI will discuss how star formation has proceeded in these regions over\nmultiple recent bursts and how the accretion process depends on the\nphysical properties of the individual stars and of the environment. We\nhave discovered an important dependence of the mass accretion rate on\nmetallicity: mass accretion rates for stars of the same mass and age are\nsystematically higher in the Magellanic Clouds than in the Milky Way and\nare expected to have been equally high at redshift z~2\, when star\nformation was at its peak in the Universe. I will also show a surprising\nanti-correlation between the variability and intensity of the Halpha\nexcess: this suggests a discrete and clumpy nature for the accretion\nprocess and reveals that the characteristic mass of the infalling parcels\nof gas is comparable to that of the moons of giant planets in the solar\nsystem. \nTo close\, I will illustrate how we plan to thoroughly verify these results\nspectroscopically and to extend them to lower mass objects and to more\nextinguished environments through already planned guaranteed-time\nobservations with the James Webb Space Telescope. Our measurements will\nprovide\, for the first time\, quantitative information on the nature\,\nexcitation\, and kinematics of the infalling gas in these dense environments.
URL:https://www.oa-roma.inaf.it/event/colloquium-by-guido-de-marchi-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
END:VCALENDAR