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SUMMARY:Stellar rejuvenation around massive black holes in the Galactic ce
 nter and metal-rich quasars\,   and gravitational wave sources in AGN disk
 s: Analog of planetary systems around massive black holes - Douglas N. C. 
 Lin (University of California\, Santa Cruz)
DTSTART:20180510T150000Z
DTEND:20180510T160000Z
UID:TALK104488@talks.cam.ac.uk
CONTACT:28811
DESCRIPTION:The prevalence of massive black holes and nuclear stellar clus
 ters implies some stars may be trapped in accretion disks around active ga
 lactic nuclei.  We determine the star trapping rate and we show that the 
 trapped stars rapidly accrete gas which leads to a top heavy initial mass 
 function similar to that found in the Galactic Center. These massive stars
  undergo supernova explosion\, pollute the accretion disks around high-red
 shift quasars to produce super solar metallicity. They also produce single
  stellar-mass black hole remnants which gain mass through accretion and ca
 pture companions.  Binary seed black holes lose angular momentum to the s
 urrounding gas to tighten their separation.  They generate intense gravit
 ational wave when they coalesce. We provide analysis on the distribution o
 f their masses\, mass ratio\, spin rate\, binary orbit-spin obliquity and 
 red-shift-dependent occurrence rate as observable predictions. I will desc
 ribe some relevant mechanisms which are analogous to the astrophysics of p
 lanet formation and the implications of this scenario in the context of 1)
  coeval population and kinematic properties of disk and S stars around the
  Galactic center\,  2) super solar metallicity\, 3) duty cycle of AGN act
 ive phase\, and 4) the rapid growth of their central massive black holes.
   
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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