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SUMMARY:Hungry black holes - tidal disruption of stars in the nuclei of ga
 laxies in OGLE and Gaia surveys. - Lukasz Wyrzykowski (Warsaw Observatory\
 , Poland)
DTSTART:20160629T124500Z
DTEND:20160629T131500Z
UID:TALK66362@talks.cam.ac.uk
CONTACT:Andrew Shannon
DESCRIPTION:There are super massive black holes in the centres of probably
  all galaxies. While the consumption of matter by the larger ones is easy 
 detectable as X-ray and optical variability\, the black holes with masses 
 smaller than 10 million suns are typically on a diet. However\, occasional
 ly a lost star wanders too close to the black hole and is tidally disrupte
 d\, emitting a transient bright flare. So far\, about few dozens of such e
 vents were detected both in X-rays and optical bands. I will present first
  results of search for optical flares in OGLE and Gaia transient surveys a
 nd discuss the link between quiescent black holes and\, so called\, "Chang
 ing-Look" QSOs.
LOCATION:Sackler Lecture Theatre\, IoA
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