BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Osservatorio Astronomico di Roma - ECPv6.15.18//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
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:20220327T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20221030T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20230326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20231029T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231010T113000
DTEND;TZID=Europe/Rome:20231010T123000
DTSTAMP:20260404T223030
CREATED:20230911T123832Z
LAST-MODIFIED:20230920T101623Z
UID:12154-1696937400-1696941000@www.oa-roma.inaf.it
SUMMARY:Alessia Tortosa: Deep broad-band X-ray investigation of extreme accretion onto supermassive black holes
DESCRIPTION:Super-Eddington accretion periods are expected to be extremely important to explain the fast growth of the first supermassive black holes (SMBHs). While standard optically thick\, geometrically thin accretion discs explain the observed spectral energy distribution (SED) of many AGN with low Eddington ratios\, at higher accretion rates the disc becomes thin or slim and the nature of the accretion changes dramatically. Slim accretion disks are thought to have SEDs that are different from thick accretion disks\, with strong anisotropy of the emitted radiation and a large fraction of the output carried out in the form of outflows and jets capable of controlling the growth and evolution of the host galaxy\, and affecting the gas reservoir available for both star formation and SMBH accretion.\nAmong all accretion modes\, accretion close or above the Eddington limit is still the least understood ones\, and it is still largely debated what are the physical properties of the X-ray emitting plasma and of the accretion flow coming from the direct relativistic environment of the SMBH.\nI will present the first systematic broad-band X-ray study of extreme accretion onto SMBHs of a sample of Hyper and Super Eddington accreting AGN with 1 < λEdd < 426. These sources belong to the Super-Eddington Accreting Massive Black Holes sample\, which contains exclusively objects with black hole masses estimated via reverberation mapping. This analysis allowed us to investigate the properties of the X-ray corona and the behaviour of the reprocessed radiation in this regime of extreme accretion\, as well as the structure of the iron complex and the properties of outflows.
URL:https://www.oa-roma.inaf.it/event/colloquium-alessia-tortosa/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231017T113000
DTEND;TZID=Europe/Rome:20231017T123000
DTSTAMP:20260404T223030
CREATED:20230911T124006Z
LAST-MODIFIED:20230920T134649Z
UID:12156-1697542200-1697545800@www.oa-roma.inaf.it
SUMMARY:colloquium Chris Sneden: Lithium-rich Red Giants:  the helium and rotation connections
DESCRIPTION:
URL:https://www.oa-roma.inaf.it/event/lithium-rich-red-giants-the-helium-and-rotation-connections/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20231024T113000
DTEND;TZID=Europe/Rome:20231024T123000
DTSTAMP:20260404T223030
CREATED:20230725T141858Z
LAST-MODIFIED:20231011T053804Z
UID:12050-1698147000-1698150600@www.oa-roma.inaf.it
SUMMARY:Tiziana Macaluso\, Francesco Poppi: Le prime osservazioni astronomiche in fotografia e le immagini conservate nell'archivio INAF-OAR. Studio a supporto del recupero conservativo.
DESCRIPTION:Le prime immagini astronomiche\, conservate presso l’archivio INAF-OAR\, sono tre dagherrotipi\nottenuti da Angelo Secchi nel 1851 presso l’Osservatorio del Collegio Romano\, in occasione\ndell’eclissi totale di Sole.\nNel 1857 fotografò anche le fasi lunari\, acquisite con il telescopio equatoriale Merz. Queste\nimmagini rappresentano il primo atlante fotografico della Luna presentato il 28 agosto 1858\nall’Académie des Sciences di Parigi\, e poi all’Osservatorio londinese di Greenwich.\nSuccessivamente\, nel 1860 Angelo Secchi osservò e stampò su carta salata l’eclissi solare\,\npartecipando alla spedizione internazionale a Las Palmas de Gran Canaria. L’osservazione\ndell’eclissi evidenziò le protuberanze solari e fu la prima prova della loro esistenza. Si dimostrò\nanche che la corona appartiene al Sole e non alla Luna.\nQueste pregevoli fotografie costituiscono anche le prime tecniche fotografiche delle origini\,\nnonché le prime osservazioni astronomiche per mezzo della fotografia.\nLo studio storico e le analisi diagnostiche di questi beni\, utile a caratterizzare la natura dei\ncomponenti e lo stato di degrado\, arricchiranno le conoscenze sia in campo storico che scientifico\,\ne supporteranno il futuro restauro conservativo\, che avverrà in collaborazione con corsi\nuniversitari sul restauro e la conservazione di beni culturali.
URL:https://www.oa-roma.inaf.it/event/colloquium-tiziana-macaluso-francesco-poppi/
LOCATION:Aula Gratton
CATEGORIES:Seminari
ORGANIZER;CN="Flavia Dell'Agli":MAILTO:flavia.dellagli@inaf.it
END:VEVENT
END:VCALENDAR