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Record Details

Record 1 of 20319
High Frequency QPOs due to Black Hole Spin
Author and Affiliation:
Kazanas, Demos(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Fukumura, K.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Abstract: We present detailed computations of photon orbits emitted by flares at the innermost stable circular orbit (ISCO) of accretion disks around rotating black holes. We show that for sufficiently large spin parameter, i.e. a > 0.94 M, flare a sufficient number of photons arrive at an observer after multiple orbits around the black hole, to produce an "photon echo" of constant lag, i.e. independent of the relative phase between the black hole and the observer, of T approximates 14 M. This constant time delay, then, leads to a power spectrum with a QPO at a frequency nu approximates 1/14M, even for a totally random ensemble of such flares. Observation of such a QPO will provide incontrovertible evidence for the high spin of the black hole and a very accurate, independent, measurement of its mass.
Publication Date: Sep 07, 2009
Document ID:
20090031968
(Acquired Sep 09, 2009)
Subject Category: ASTROPHYSICS
Document Type: Conference Paper
Meeting Information: X-RAY ASTRONOMY 2009: PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES; 7th -11th Sept. 2009; Bologna; Italy
Meeting Sponsor: Bologna Univ.; Italy
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ACCRETION DISKS; BLACK HOLES (ASTRONOMY); HIGH FREQUENCIES; PHOTONS; ORBIT CALCULATION; STELLAR OSCILLATIONS
Availability Source: Other Sources
Availability Notes: Abstract Only
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