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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20110303T000000
DTEND;TZID=Atlantic/Canary:20110303T010000
UID:iactalks-249
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/249
CREATED:2011-03-03T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:A search for supermassive binary black holes
DESCRIPTION:A search for supermassive binary black holes\nMiss Mar Mezcua\n
 \nThe detection and number estimates of supermassive binary black holes (S
 MBBHs) provide important constraints on the hierarchical models for galaxy
  formation and evolution. I will present two different approaches for the 
 possible identification of SMBBHs. 1.Radio-optical studies of X-shaped rad
 io sources:X-shaped radio galaxies are extragalactic radio sources that pr
 esent two pairs of radio lobes passing symmetrically through the center of
  the host galaxy, giving the galaxy the X-shaped morphology seen on radio 
 maps.This morphology can reflect either a recent merger of two supermassiv
 e black holes or the presence of a second active black hole in the galacti
 c nucleus. This scenario is studied by determining the mass, luminosity, j
 et dynamic age and starburst of a sample of X-shaped sources and comparing
  the results to a sample of radio-loud active nuclei with similar redshift
  and luminosities. 2.Compact radio emission in ULX objects: Ultraluminous 
 X-ray sources (ULXs) have luminosities exceeding 10E39 erg/s, suggesting e
 ither the presence of black holes larger than stellar mass black holes or 
 sources apparently radiating above the Eddington limit. I will present mil
 liarcsecond-scale radio observations of some ULXs located within optical b
 right galaxies, resolving their compact radio emission, and measuring its 
 brightness temperature and spectral properties. This allows us to uncover 
 the nature of these sources and investigate whether they are intermediate 
 mass black holes or supermassive black holes stripped of their accretion d
 isks in post-merger systems.
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