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DTSTART;TZID=Europe/Rome:20230221T113000
DTEND;TZID=Europe/Rome:20230221T123000
DTSTAMP:20260407T173956
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
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DTSTART;TZID=Europe/Rome:20230228T113000
DTEND;TZID=Europe/Rome:20230228T123000
DTSTAMP:20260407T173956
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
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