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SUMMARY:A New Method of Determining Black Hole Spin and Accretion Disk Pro
 perties for Supermassive and Stellar-mass Black Holes - Ruth Daly (Penn St
 ate)
DTSTART:20210225T160000Z
DTEND:20210225T170000Z
UID:TALK155587@talks.cam.ac.uk
CONTACT:Dominic Walton
DESCRIPTION:Black hole systems\, consisting of a black hole\, accretion di
 sk\, and collimated outflow\, will be discussed. Three samples of active g
 alactic nuclei (AGN)\, including 756 AGN\, and 102 measurements of four st
 ellar-mass galactic black holes (GBHs) will be considered. General express
 ions will be derived and applied to obtain the black hole spin function\, 
 spin\, and accretion disk magnetic field strength in dimensionless and phy
 sical units for each source. Relatively high spin values are obtained. The
  distributions of accretion disk magnetic field strengths for the three AG
 N samples are quite broad and have mean values of about 10 kG\, while thos
 e for stellar-mass GBHs have mean values of about 100 MG. Reasonable agree
 ment is found between spin values obtained here and published values obtai
 ned with a well-established method. Black hole spin and disk magnetic fiel
 d strength demographics indicate that black hole spin functions\, spins\, 
 and disk magnetic field strengths are similar for the AGN source types stu
 died. Mass accretion rates are obtained in dimensionless and physical unit
 s using a new method. The results and implications of these studies will b
 e discussed.
LOCATION:ONLINE - Details will be sent by email
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