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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20140320T103000
DTEND;TZID=Atlantic/Canary:20140320T113000
UID:iactalks-625
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/625
CREATED:2014-03-20T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Mining the gap; understanding galaxy formation using the luminosity
  gap 
DESCRIPTION:Mining the gap; understanding galaxy formation using the lumino
 sity gap \nDr. Habib Khosroshahi\n\nMajority of galaxies reside in groups 
 and clusters where they are  understood to evolve also through galaxy-gala
 xy interactions. Multiple  mergers at the core of galaxy groups can develo
 p a luminosity deficiency  or gap, which is quantified as the difference b
 etween the luminosity of  the two brightest galaxies in groups and cluster
 s. This observable  carries important information about the evolution of g
 alaxy groups, for  instance, there are indications that collapsed groups w
 ith a large  luminosity gap, known as fossil groups, are associated with t
 he halos  that are relatively old. In a series of recent studies, employin
 g X-ray,  optical and radio observations complemented by cosmological  sim
 ulations, we have utilised the luminosity gap to probe the formation  scen
 arios for galaxies and specially the most luminous galaxies in  groups and
  clusters, introduce a powerful age-date routine for galaxy  groups, and a
 lso obtain clues about the AGN activities and the IGM  heating.
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