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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20200528T103000
DTEND;TZID=Atlantic/Canary:20200528T113000
UID:iactalks-1407
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1407
CREATED:2020-05-28T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:The Golden Mass of Galaxies and Black Holes
DESCRIPTION:The Golden Mass of Galaxies and Black Holes\nProf. Avishai Deke
 l\n\nThis talk will address the preferred mass and time for galaxy formati
 on, in dark-matter haloes similar to that of the Milky way but when the Un
 iverse was a few Gigayears old. It is proposed that this is due to the int
 erplay between two mechanisms, first *supernova* feedback that remove
 s gas from the galaxy, and second *hot gas* in the deep potential wel
 l of massive haloes that suppresses cold gas supply to the galaxy, the two
  being effective in galaxies of lower and higher masses respectively. Cosm
 ological simulations reveal that the same mechanisms are responsible for a
  robust sequence of events were galaxies undergo a dramatic gaseous *compa
 ction*, sometimes caused by mergers, into a compact star-forming “bl
 ue nugget”. This triggers inside-out *quenching* of star format
 ion, which is maintained by a hot massive halo aided by black-hole feedbac
 k, leading to todays passive elliptical galaxies. The blue-nugget phase is
  responsible for drastic transitions in the main galaxy structural, kinema
 tic and compositional properties. In particular, the growth of the *black 
 hole* in the galaxy center, first suppressed by supernova feedback wh
 en below the critical mass, is boosted by the compaction event and keeps g
 rowing once the halo is massive enough to lock the supernova ejecta by its
  deep potential well and the hot halo. The compaction events also trigger 
 the formation of extended rings in high-z massive galaxies. These events a
 ll occur near the same characteristic halo mass, giving rise to the highes
 t efficiency of galaxy formation and black-hole growth at this magic mass 
 and time.\n \nZoom link:  https://rediris.zoom.us/j/9881348
 7304
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