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X-WR-CALNAME:Osservatorio Astronomico di Roma
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X-WR-CALDESC:Eventi per Osservatorio Astronomico di Roma
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TZID:Europe/Rome
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TZOFFSETFROM:+0100
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TZNAME:CEST
DTSTART:20170326T010000
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DTSTART:20171029T010000
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DTSTART:20180325T010000
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DTSTART:20191027T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181106T114500
DTEND;TZID=Europe/Rome:20181106T124500
DTSTAMP:20260404T181612
CREATED:20180725T065755Z
LAST-MODIFIED:20180725T065755Z
UID:4753-1541504700-1541508300@www.oa-roma.inaf.it
SUMMARY:eROSITA: Stellar science with a new X-ray All-Sky Survey
DESCRIPTION:Nearly 30 years after ROSAT\, the german-russian mission eROSITA\, planned for\nlaunch in spring 2019\, is going to perform a new X-ray All-Sky Survey.\nThe majority of sources that will be detected with eROSITA are\nlate-type stars. I present eROSITA science cases for pre-main sequence and\nfor hydrogen-burning stars based on current studies with other\nX-ray instruments. New momentum is expected from eROSITA especially\nfor stellar population and variability studies. These comprise a wide range\nof topics including studies of the dynamics of stellar coronae (through\nflares and activity cycles)\, search for X-rays from accretion outbursts\nin young stars\, and the use of X-rays as diagnostics for\nstellar angular momentum evolution and the structure of the galactic\nstellar disk.
URL:https://www.oa-roma.inaf.it/event/colloquium-beate-stelzer-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181106T114500
DTEND;TZID=Europe/Rome:20181106T124500
DTSTAMP:20260404T181612
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
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20181108T114500
DTEND;TZID=Europe/Rome:20181108T124500
DTSTAMP:20260404T181612
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:20260404T181612
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:20181112T114500
DTEND;TZID=Europe/Rome:20181112T124500
DTSTAMP:20260404T181612
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:20260404T181612
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:20181120T114500
DTEND;TZID=Europe/Rome:20181120T124500
DTSTAMP:20260404T181612
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:20181120T114500
DTEND;TZID=Europe/Rome:20181120T124500
DTSTAMP:20260404T181612
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:20181127T114500
DTEND;TZID=Europe/Rome:20181127T124500
DTSTAMP:20260404T181612
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:20181127T114500
DTEND;TZID=Europe/Rome:20181127T124500
DTSTAMP:20260404T181612
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
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