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28 March 2024
 
  » arxiv » astro-ph/0403198

 Article overview


Correlations of Power-law Spectral and QPO Features In Black Hole Candidate Sources
Ralph Fiorito ; Lev Titarchuk ;
Date 9 Mar 2004
Journal Prog.Theor.Phys.Suppl. 155 (2004) 325-326
Subject astro-ph
AffiliationCatholic University of America/NASA-GSFC), Lev Titarchuk (George Mason University/Naval Research Laboratory
AbstractRecent studies have shown that strong correlations are observed between low frequency QPO`s and the spectral power law index for a number of black hole candidate sources (BHC’s), when these sources exhibit quasi-steady hard x-ray emission states. The dominant long standing interpretation of QPO’s is that they are produced in and are the signature of the thermal accretion disk. Paradoxically, strong QPO`s are present even in the cases where the thermal component is negligible. We present a model which identifies the origin of the QPO’s and relates them directly to the properties of a compact coronal region which is bounded by the adjustment from Keplerian to sub-Keplerian inflow into the BH and which is primarily responsible for the observed power law spectrum. The model also predicts the relationship between high and low frequency QPO’s and shows how BH’s can be unique identified from observations of the soft states of NS’s and BHC’s.
Source arXiv, astro-ph/0403198
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