BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Osservatorio Astronomico di Roma - ECPv6.15.18//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Osservatorio Astronomico di Roma
X-ORIGINAL-URL:https://www.oa-roma.inaf.it
X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Rome
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20170326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20171029T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20180325T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20181028T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20190331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20191027T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20200329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20201025T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190219T114500
DTEND;TZID=Europe/Rome:20190219T124500
DTSTAMP:20260405T015240
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:20260405T015240
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
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190214T114500
DTEND;TZID=Europe/Rome:20190214T124500
DTSTAMP:20260405T015240
CREATED:20181106T174714Z
LAST-MODIFIED:20181106T174714Z
UID:4817-1550144700-1550148300@www.oa-roma.inaf.it
SUMMARY:colloquium - Giuseppe Tanzella-Nitti
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-giuseppe-tanzella-nitti/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190212T114500
DTEND;TZID=Europe/Rome:20190212T124500
DTSTAMP:20260405T015240
CREATED:20181010T170838Z
LAST-MODIFIED:20190122T090137Z
UID:4775-1549971900-1549975500@www.oa-roma.inaf.it
SUMMARY:Stellar Populations in Local and high redshift Universe
DESCRIPTION:Synthetic stellar libraries are quite popular to constrain the stellar pop-\nulations (age and metallicity distribution) of unresolved systems like high redshift galaxies.\nHowever\, they are typically based on theoretical Spectral Energy Distributions (SEDs).\nIt is important to build up empirical synthetic stellar li-\nbraries\, calibrated on local systems and\ncovering a broad range in ages (globular clusters\, old open clusters)\,\nchemical compositions (iron\, alpha\, CNO) and dynamical properties (nearby\ndwarf galaxies)\, able to improve our SED fitting codes to deeply investigate\nhigh redshift galaxies.\nTo do that\, I am taking advantages of a sample of 65 Galactic globular clus-\nters (GGCs) for which we have accurate and homogeneous optical photometry\nbased on space (ACS at HST\, innermost regions) and ground-based\n(up to the tadial radius).\nIn particular\, I will present the results on the study of the Horizontal Branch\n(HB) morphology for 64 GGCs in our sample.\nI will introduce a very new photometric morphology index based\non the cumulative density function of the stars along the HB\,\nuseful to investigate the well known “second\nparameter problem” affecting age estimations and so\, stellar libraries.\nI will also discuss the results of the analysis on galaxy\nevolution through the Galaxy Stellar Mass Function (GSMF) up to redf-\nshift 4\, obtained combining all the five CANDELS fields (GOODS-South\,\nGOODS-North\, EGS\, COSMOS\, UDS)\, the Frontier Fields Parallels (Abell 2744\,\nMACSJ0416\, MACSJ0717\, MACSJ1149) and the Ultravista/COSMOS\nfield. Stellar masses have been estimated fitting the photometry to syn-\nthetic models: these surveys are characterized by multi-wavelength (deep\noptical/near-infrared/mid-infrared) coverage (CANDELS)\, very high limiting magnitudes\n(Frontier Fields) and large areas (UltraVista)\, allowing to explore the GSMF\nfrom low masses to the high-mass end.
URL:https://www.oa-roma.inaf.it/event/colloquium-marianna-torelli-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190212T114500
DTEND;TZID=Europe/Rome:20190212T124500
DTSTAMP:20260405T015240
CREATED:20181010T170838Z
LAST-MODIFIED:20181010T170838Z
UID:4438-1549971900-1549975500@www.oa-roma.inaf.it
SUMMARY:Colloquium - Marianna Torelli
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-marianna-torelli/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190205T114500
DTEND;TZID=Europe/Rome:20190205T124500
DTSTAMP:20260405T015240
CREATED:20180731T173932Z
LAST-MODIFIED:20180731T173932Z
UID:4274-1549367100-1549370700@www.oa-roma.inaf.it
SUMMARY:colloqium - Eva Villaver
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloqium-eva-villaver/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190205T114500
DTEND;TZID=Europe/Rome:20190205T124500
DTSTAMP:20260405T015240
CREATED:20180731T173932Z
LAST-MODIFIED:20190114T134429Z
UID:4762-1549367100-1549370700@www.oa-roma.inaf.it
SUMMARY:From AGB stars to Planetary Nebulae: what the ISM\, stellar rotation\, and companions can do
DESCRIPTION:Asymptotic giant branch (AGB) stars lose their envelopes by means of heavy mass-loss rates. Besides the mass-loss process itself there are other mechanisms that influence the evolution of the star and of what we see as Planetary Nebulae. Among them are the interaction of the ejecta with the interstellar medium (ISM)\, the inclusion of stellar rotation and/or the presence of a companion. I will present our simulation of the interaction process between AGB stars and  the ISM. I will show what we can expect for the planetary nebula formation when we include rotation in stellar evolution models and finally I will describe how these stars are influenced by the presence of external companions
URL:https://www.oa-roma.inaf.it/event/colloqium-eva-villaver-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190130T114500
DTEND;TZID=Europe/Rome:20190130T124500
DTSTAMP:20260405T015240
CREATED:20190122T130016Z
LAST-MODIFIED:20190122T130016Z
UID:5178-1548848700-1548852300@www.oa-roma.inaf.it
SUMMARY:Ultraviolet imager with wide-field & deep for astronomical observation and study
DESCRIPTION:Base on the ultraviolet radiation characteristics of cosmic celestial models and different morphological materials\, the astronomical ultraviolet band observation has important scientific significance and research value for the study of astronomical scientific problems such as searching for the cosmic missing baryons\, studying the transport process of stellar and galaxies in the cosmic environment. China is currently developing the space station optical facility with an observation band covering near ultraviolet to infrared range. The wide-field deep ultraviolet imager (WDUI) is proposed on the optical facility of the China space station (CSS)\, which can overcome the influence of the Earth’s atmosphere and obtain the remarkable astronomical observation  efficiency in the ultraviolet band. It promotes the development level of the astronomical ultraviolet band observation instrument and promotes the observation of the ultraviolet astronomical section of the space astronomical science. Output of scientific achievements has a positive effect. This talk reviews the background of the payload proposal\, the astronomical observation capability of the CSS optical facility\, the scientific goals of the payload\, the preliminary system design and technical characteristics of the payload\, and possible other band observations.
URL:https://www.oa-roma.inaf.it/event/ultraviolet-imager-with-wide-field-deep-for-astronomical-observation-and-study/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190129T114500
DTEND;TZID=Europe/Rome:20190129T124500
DTSTAMP:20260405T015240
CREATED:20181008T132647Z
LAST-MODIFIED:20181008T132647Z
UID:4434-1548762300-1548765900@www.oa-roma.inaf.it
SUMMARY:colloquium - Antonio Stamerra
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-antonio-stamerra/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190129T114500
DTEND;TZID=Europe/Rome:20190129T124500
DTSTAMP:20260405T015240
CREATED:20181008T132647Z
LAST-MODIFIED:20190123T133205Z
UID:4774-1548762300-1548765900@www.oa-roma.inaf.it
SUMMARY:Multimessenger astrophysics with active galactic nuclei: observational clues of gamma-neutrino connection in blazars
DESCRIPTION:The clear detection of an isotropic flux of very high energy neutrinos by the IceCube experiment has opened the quest for the identification of their possibile electro-magnetic (EM) counterparts. Active Galactic Nuclei (AGNs) of the blazar category are considered as the main cosmic neutrino source candidates\, although contribution from other types of active galaxies and Galactic sources is expected. Observation of transient EM emission\, spatially and temporally compatible with the IceCube neutrinos\, is crucial to identify their possible counterpart. Since April 2016\, the IceCube Collaboration alerts the astronomical community whenever a high-energy single neutrino-induced event – HESE – is detected. Thanks to the IceCube real time system and the fast space- and ground-based observations which followed the alert\, a neutrino event recorded on Sept. 22nd\, 2017\, has been significantly associated for the first time to a quasi-simultaneous gamma-ray flare observed by Fermi-LAT\, AGILE and the MAGIC experiment from the AGN blazar TXS 0506+056. In this talk\, we will review this multi-messenger result\, mainly focussing on the MAGIC detection\, and we will present some new results about possible transient gamma-ray sources observed by AGILE\, coincident in time and space with public IceCube HESE neutrino events.
URL:https://www.oa-roma.inaf.it/event/colloquium-antonio-stamerra-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190122T114500
DTEND;TZID=Europe/Rome:20190122T124500
DTSTAMP:20260405T015240
CREATED:20180725T070311Z
LAST-MODIFIED:20180725T070311Z
UID:4172-1548157500-1548161100@www.oa-roma.inaf.it
SUMMARY:colloquium - Viola Allevato
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-viola-allevato/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190122T114500
DTEND;TZID=Europe/Rome:20190122T124500
DTSTAMP:20260405T015240
CREATED:20180725T070311Z
LAST-MODIFIED:20190108T105344Z
UID:4757-1548157500-1548161100@www.oa-roma.inaf.it
SUMMARY:Clustering dependence of X-ray AGN on host galaxy properties
DESCRIPTION:The presence of a super massive BH in almost all galaxies in the Universe is an accepted paradigm in astronomy. How these BHs form and how they co-evolve with the host galaxy is one of the most intriguing unanswered problems in modern Cosmology and of extreme relevance to understand the issue of galaxy formation. Clustering measurements can powerfully test theoretical model predictions of BH triggering scenarios and put constraints on the typical environment where AGN live in\, through the connection with their host dark matter halos. In this presentation I will talk about the clustering properties of X-ray AGN from both an observational and theoretical point of view\, using the new catalog of AGN detected by Chandra in COSMOS and semi-empirical models. The Chandra COSMOS-Legacy catalog is one of the largest available sample of X-ray AGN for clustering studies\, allowing clustering measurements as a function of obscuration\, luminosity and AGN host galaxy properties.
URL:https://www.oa-roma.inaf.it/event/colloquium-viola-allevato-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190115T114500
DTEND;TZID=Europe/Rome:20190115T124500
DTSTAMP:20260405T015240
CREATED:20180922T063208Z
LAST-MODIFIED:20180922T063208Z
UID:4416-1547552700-1547556300@www.oa-roma.inaf.it
SUMMARY:colloqium - Cristina Ramos Almeida
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloqium-cristina-ramos-almeida/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20190115T114500
DTEND;TZID=Europe/Rome:20190115T124500
DTSTAMP:20260405T015240
CREATED:20180922T063208Z
LAST-MODIFIED:20190108T113910Z
UID:4771-1547552700-1547556300@www.oa-roma.inaf.it
SUMMARY:An infrared and sub-mm view of AGN obscuration and feedback
DESCRIPTION:In the past 10-15 years our view of AGN has significantly evolved thanks to the combination of new observations and models. X-ray\, infrared and sub-mm data have been crucial to peer into the inner region of AGN and study the properties of the tori\, circum-nuclear disks and nuclear outflows. In this talk I will summarize our current view of nuclear obscuration in AGN\, focusing on the variations of the torus properties with gas phase. I will also present preliminary results of a new project aimed to characterize nuclear outflows in three gas phases (ionized\, coronal and molecular) in a sample of nearby type-2 quasars and study their impact in the stellar populations\, on-going star formation and molecular gas reservoirs of the galaxies.
URL:https://www.oa-roma.inaf.it/event/colloqium-cristina-ramos-almeida-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181218T114500
DTEND;TZID=Europe/Rome:20181218T124500
DTSTAMP:20260405T015240
CREATED:20180725T070155Z
LAST-MODIFIED:20180725T070155Z
UID:4170-1545133500-1545137100@www.oa-roma.inaf.it
SUMMARY:colloquium - Gioia Rau
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-gioia-rau/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181218T114500
DTEND;TZID=Europe/Rome:20181218T124500
DTSTAMP:20260405T015240
CREATED:20180725T070155Z
LAST-MODIFIED:20181210T123509Z
UID:4756-1545133500-1545137100@www.oa-roma.inaf.it
SUMMARY:How to tackle a giant Star: multi-wavelength studies of cool\, evolved stars\, using HST and VLTI
DESCRIPTION:The chemical enrichment of the Universe is considerably affected by the contributions of Giant stars. Giant and supergiant stars are surrounded by a hot layer called the chromosphere\, which could likely powers Magneto-Hydrodynamic Alfven waves that could initiate their mass loss. Toward the end of their life\, on the Asymptotic Giant Branch (AGB)\, stars produce heavy chemical elements\, molecules\, and dust\, which\, through the mass loss provided via their stellar winds\, are placed into the interstellar medium.\nThis talk will explore ongoing work modeling high-resolution spectroscopic observations with Hubble Space Telescope instruments (Rau et al. 2018)\, to reveal the role of the chromosphere in driving K-M giant and supergiant winds. Our results include estimates of wind and chromospheric parameters\, mass-loss rates\, and fundamental stellar parameters.\nIn addition\, ground-based interferometric measurements with high-angular resolution instruments from VLTI\, such as MIDI (Rau et al. 2015\, Rau et al. 2017)\, GRAVITY (Wittkowski\, Rau et al. 2018)\, help to test geometrical and dynamical models describing the behavior of the outer AGB atmospheres at various spatial scales. In this way we are able to unravel the role of molecules and dust in their extended atmospheres.\nFuture plans include the use of high-angular resolution instruments such as VEGA at CHARA\, and MATISSE at VLTI\, to better understand the behavior of cool stars outer atmospheres at various spatial scales.
URL:https://www.oa-roma.inaf.it/event/colloquium-gioia-rau-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181211T114500
DTEND;TZID=Europe/Rome:20181211T124500
DTSTAMP:20260405T015240
CREATED:20180910T113353Z
LAST-MODIFIED:20180910T113353Z
UID:4374-1544528700-1544532300@www.oa-roma.inaf.it
SUMMARY:colloquium - Marco Padovani
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-marco-padovani/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181211T114500
DTEND;TZID=Europe/Rome:20181211T124500
DTSTAMP:20260405T015240
CREATED:20180910T113353Z
LAST-MODIFIED:20181203T092120Z
UID:4768-1544528700-1544532300@www.oa-roma.inaf.it
SUMMARY:The role of cosmic rays on physical and chemical processes of the interstellar medium
DESCRIPTION:The study of the interaction of cosmic rays with the interstellar matter is a multi-disciplinary investigation that involves the analysis of several physical and chemical processes: ionisation of atomic and molecular hydrogen\, energy loss by elastic and inelastic collisions\, energy deposition by primary and secondary electrons\, gamma-ray production by pion decay\, the production of light elements by spallation reactions\, and much more. Cosmic-ray ionisation activates the rich chemistry of dense molecular clouds and determines the degree of coupling of the gas with the local magnetic field\, which in turn controls the collapse timescale and the star-formation efficiency of a molecular cloud. In recent years a wealth of observations from the ground and from space has provided information and constraints that still need to be incorporated in a consistent global theoretical framework. My goal is to use the results of chemical models and state-of-the-art numerical simulations supplemented by dedicated observations to provide a unifying interpretation of the data with a model of cosmic-ray propagation specifically developed to make predictions that can be tested against the observations. Finally\, I will talk about my most recent study: a mechanism able to accelerate local thermal particles in protostars that can be used to explain the high ionisation rate as well as the synchrotron emission observed towards protostellar sources.
URL:https://www.oa-roma.inaf.it/event/colloquium-marco-padovani-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181206T114500
DTEND;TZID=Europe/Rome:20181206T124500
DTSTAMP:20260405T015240
CREATED:20181106T172218Z
LAST-MODIFIED:20181106T172218Z
UID:4814-1544096700-1544100300@www.oa-roma.inaf.it
SUMMARY:Paolo Dal Pozzo Toscanelli\, Cosimo de’ Medici and the Sky of the Magi:  a new reading of the Florentine Celestial Hemispheres in the Sagrestia Vecchia at San Lorenzo and in the Pazzi Chapel at Santa Croce.
DESCRIPTION:After 30 years since the historical pubblication of the analysis\nconducted by Forti\, Lapi Ballerini\, Monsignori Fossi and Ranfagni (1987)\, I\noffer a careful re-examination of the two famous florentine starry vaults of\nthe early Renaissance\, taking into account the recent restoration of the\nhemisphere of the Pazzi Chapel and the almost coeval maps drawn by Paolo\nDal Pozzo Toscanelli for his studies of comets in 1456 (Halley) and 1457.\nThe authorship by the Tuscan cosmographer is confirmed in the Sagrestia\nVecchia on the basis of a comparison between a sample of stars from the\ndome\, Toscanelli’s maps and Ptolemy’s Catalogue. The Pazzi Chapel instead\,\nreveals on close inspection to be a clumsy\, derivative later work.\nWhile the double date proposed in 1987\, the enigmatic 4/5 july 1442\, still\nremains astronomically the most probable\, I will show that the exactness of\nthe planetary positions have been overestimated\, unfairly provoking a lack of\nattention for other candidate dates\, more astrologically meaningful if not\ndepicted with satisfying correctness. Relying indeed on the astrological\ntechniques and interests of the time\, I propose to assess the 1442 and the\n1439 most probable candidate horoscopes following the very appropriate line\nof reasoning introduced by Dieter Blume (2000)\, i.e. considering the\ncongruence of the sky charts with principles and rules of astral divination as\nwell as with the political situation in Florence and with the cultural needs of\nthe clients.\nFinally\, I single out as most probable the second date (even exhibiting a\nmarginal evidence for it on the basis of Lorenzo de’ Medici’s calendarial\nconcerns)\, and I offer a new hypothetical explanation for this preference\,\nlinking medicean interest in the magian narrative and the Star of Bethlehem\,\nastrological speculation and political propaganda.
URL:https://www.oa-roma.inaf.it/event/paolo-dal-pozzo-toscanelli-cosimo-de-medici-and-the-sky-of-the-magi-a-new-reading-of-the-florentine-celestial-hemispheres-in-the-sagrestia-vecchia-at-san-lorenzo-and-in-the-pazzi-chapel-at/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181204T114500
DTEND;TZID=Europe/Rome:20181204T124500
DTSTAMP:20260405T015240
CREATED:20180804T134547Z
LAST-MODIFIED:20181119T172935Z
UID:4763-1543923900-1543927500@www.oa-roma.inaf.it
SUMMARY:The evolution of CNO isotope ratios: a litmus test for stellar IMF variations in galaxies across cosmic time
DESCRIPTION:Determining the shape of the stellar initial mass function (IMF) and whether it is constant or varies in space and time is the Holy Grail of modern astrophysics\, with profound implications for all theories of star and galaxy formation. On a theoretical ground\, the extreme conditions for star formation (SF) encountered in the most powerful starbursts in the Universe are expected to favour the formation of massive stars. Direct methods of IMF determination\, however\, cannot probe such systems\, because of the severe dust obscuration affecting their starlight. The next best option is to observe CNO bearing molecules in the interstellar medium at millimetre/submillimetre wavelengths\, which\, in principle\, provides the best indirect evidence for IMF variations. In this talk\, I discuss some recent findings on this issue. First\, I reassess the roles of different types of stars in the production of CNO isotopes\, by using a proprietary chemical evolution code and up-to-date Milky Way data from the literature. The model is then extended to discuss extragalactic data. I show that\, though significant uncertainties still hamper our knowledge of the evolution of CNO isotopes in galaxies\, compelling evidence for an IMF skewed towards high-mass stars can be found for galaxy-wide starbursts. In particular\, I show the results for a sample of submillimetre galaxies observed by our team with the Atacama Large Millimetre Array at the peak of the SF activity of the Universe\, for which we measure a ratio 13C/18O of about 1. This isotope ratio is especially sensitive to IMF variations\, and little affected by observational uncertainties. At the end\, ongoing and future developments of our work are briefly outlined.
URL:https://www.oa-roma.inaf.it/event/colloqium-donatella-romano-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181204T114400
DTEND;TZID=Europe/Rome:20181204T124500
DTSTAMP:20260405T015240
CREATED:20180804T134547Z
LAST-MODIFIED:20180804T134547Z
UID:4313-1543923840-1543927500@www.oa-roma.inaf.it
SUMMARY:Colloqium - Donatella Romano
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloqium-donatella-romano/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181127T114500
DTEND;TZID=Europe/Rome:20181127T124500
DTSTAMP:20260405T015240
CREATED:20180725T070044Z
LAST-MODIFIED:20180725T070044Z
UID:4168-1543319100-1543322700@www.oa-roma.inaf.it
SUMMARY:colloquium - Juie Shetye
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-juie-shetye/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181127T114500
DTEND;TZID=Europe/Rome:20181127T124500
DTSTAMP:20260405T015240
CREATED:20180725T070044Z
LAST-MODIFIED:20181106T052453Z
UID:4755-1543319100-1543322700@www.oa-roma.inaf.it
SUMMARY:Exploring the solar chromosphere with ground-based telescopes
DESCRIPTION:The Sun’s atmosphere consists of the photosphere\, chromosphere and corona. The solar chromosphere bridges the photosphere and the corona. This dynamic layer is filled with events that evolve in a fraction of time and are very small in spatial scales. We use the biggest solar telescopes to zoom into this layer in order to understand such dynamic events.\n\nIn the talk\, we discuss detailed observations of two different events guided by high-resolution and high-cadence observations. The first topic covers a statistical study of long thin jets called “spicules.” Spicules wiggle and sway around to give an impression of waves propagating along them. These waves can travel with speeds of hundreds of kilometres per second\, energising the solar chromosphere. The second topic is about swirling-whirling events that look like tornadoes. These churn matter from the lower photosphere to the chromosphere. Studying the behaviour of these events is vital in understanding a decade-long question in solar physics\, that addresses the heating of the Sun’s atmosphere.\nA future goal is to support such observation by performing Magnetohydrodynamic (MHD) simulations using LareXd\, developed here at Centre for Fusion Space and Astrophysics (CFSA)\, University of Warwick. In the end\, we would have a glimpse of what the future of ground-based observations holds. We will see the latest progress on next-generation solar telescope Daniel K. Inouye Solar Telescope (DKIST) and what we at CFSA\, Warwick are expecting from it.
URL:https://www.oa-roma.inaf.it/event/colloquium-juie-shetye-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181120T114500
DTEND;TZID=Europe/Rome:20181120T124500
DTSTAMP:20260405T015240
CREATED:20180725T065904Z
LAST-MODIFIED:20180725T065904Z
UID:4166-1542714300-1542717900@www.oa-roma.inaf.it
SUMMARY:colloquium - Fabrizio Arrigoni Battaia
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-fabrizio-arrigoni-battaia/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181120T114500
DTEND;TZID=Europe/Rome:20181120T124500
DTSTAMP:20260405T015240
CREATED:20180725T065904Z
LAST-MODIFIED:20181115T140858Z
UID:4754-1542714300-1542717900@www.oa-roma.inaf.it
SUMMARY:Characterizing the circum/inter-galactic gas in emission around z~2-3 quasars
DESCRIPTION:Recently\, enormous (> 200 kpc) Lyman-alpha nebulae (ELAN) have been discovered around radio-quiet z~2-3 quasars. Being currently explained as powered by the ionizing radiation of quasars\, these bright large-scale nebulosities suggest the possibility of studying the circum/inter-galactic gas in emission around individual systems on very large scales. Motivated by these discoveries\, we have been conducting a statistical census of z~2-3 quasars using the narrow-band and IFU technique with the aim to determine the frequency of this phenomenon\, as well as to study their size\, luminosity\, covering factor\, and the gas physical properties.\nIn the first part of my talk I will present the results of the QSO MUSEUM survey\n(Quasar Snapshot Observations with MUse: Searching for Extended Ultraviolet eMission)\, which comprises 61 z~3 quasars observed with the MUSE/VLT instrument.\nIn the second part of the talk I will then focus on one of these objects which suggests that\nLyman-alpha could be used to trace the inspiraling motions of the cool circum-galactic medium\,\npredicted to take place on hundreds of kpc within massive halos.\nI will conclude by summarizing my on-going observational effort in characterizing the ELAN phenomenon\, and large-scale gas structures around quasars.
URL:https://www.oa-roma.inaf.it/event/colloquium-fabrizio-arrigoni-battaia-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181112T114500
DTEND;TZID=Europe/Rome:20181112T124500
DTSTAMP:20260405T015240
CREATED:20180825T073304Z
LAST-MODIFIED:20180825T073304Z
UID:4346-1542023100-1542026700@www.oa-roma.inaf.it
SUMMARY:colloquium - Svetlana Zhukovska
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-svetlana-zhukovska/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181112T114500
DTEND;TZID=Europe/Rome:20181112T124500
DTSTAMP:20260405T015240
CREATED:20180825T073304Z
LAST-MODIFIED:20181106T045954Z
UID:4766-1542023100-1542026700@www.oa-roma.inaf.it
SUMMARY:AGB stars and the cosmic dust cycle
DESCRIPTION:Theoretical and observational studies of dust condensed in outflows from AGB stars have substantially advanced the understanding of the dust mixture from individual stars. This detailed information incorporated into models of the lifecycle of interstellar grains allows us to evaluate the contribution of AGB stellar populations to the galactic dust budget\, their role in the dust production in galaxies of various morphological types. I will highlight some questions of galactic evolution that can be answered by these models in combination with modern infrared observations. I will also present models of dust evolution in an inhomogeneous\, multi-phase ISM that shed light on the dust mass growth in clouds\, an important dust formation mechanism in evolved galaxies.
URL:https://www.oa-roma.inaf.it/event/colloquium-svetlana-zhukovska-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181108T114500
DTEND;TZID=Europe/Rome:20181108T124500
DTSTAMP:20260405T015240
CREATED:20180914T090125Z
LAST-MODIFIED:20180914T090125Z
UID:4381-1541677500-1541681100@www.oa-roma.inaf.it
SUMMARY:colloquium - Fabrizio Nicastro
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-fabrizio-nicastro/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181108T114500
DTEND;TZID=Europe/Rome:20181108T124500
DTSTAMP:20260405T015240
CREATED:20180914T090125Z
LAST-MODIFIED:20181106T172335Z
UID:4770-1541677500-1541681100@www.oa-roma.inaf.it
SUMMARY:Missing Baryons and the Warm-Hot Intergalactic Medium
DESCRIPTION:It has been known for decades that the observed number of baryons in the local Universe falls about 30-40% short of the total number of baryons predicted by Big-Bang Nucleosynthesis\, inferred by density fluctuations of the Cosmic Microwave Background and seen during the first 2-3 billion years of the universe (redshift z>2-3) in the so called “Lyman-α Forest”. While theory provides a reasonable solution to this paradox\, by locating the missing baryons in hot and tenuous filamentary gas connecting galaxies\, it also sanctions the difficulty of detecting them because their by far largest constituent\, hydrogen\, is mostly ionized and therefore virtually invisible in ordinary signal-to-noise Far-Ultraviolet spectra. Indeed\, despite the large observational efforts\, only a few marginal claims of detection have been made so far.Here I will first review the observational efforts pursued over the past 15 years by several groups and will then present our recent results that show that the missing baryons are indeed found in a tenuous warm-hot and moderately enriched medium that traces large concentrations of galaxies and permeates the space between and around them. The detection of these baryons is hampered by foreground ISM  contamination\, which is hard to correct for\, due to our poor knowledge of inner-shell resonant transitions from metals in the X-ray band. Despite these intrinsic difficulties\, I will show that the number of OVII systems detected down to the sensitivity threshold of our data\, agrees well with numerical simulation predictions for the long-sought hot intergalactic medium\, and its detection adds a fundamental tile to the long-standing missing baryon puzzle. Finally\, I will comment on the implications of these new results for future high resolution X-ray missions.
URL:https://www.oa-roma.inaf.it/event/colloquium-fabrizio-nicastro-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181106T114500
DTEND;TZID=Europe/Rome:20181106T124500
DTSTAMP:20260405T015240
CREATED:20180725T065755Z
LAST-MODIFIED:20180725T065755Z
UID:4164-1541504700-1541508300@www.oa-roma.inaf.it
SUMMARY:colloquium - Beate Stelzer
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/colloquium-beate-stelzer/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
END:VCALENDAR