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25 October 2021
 
  » arxiv » astro-ph/0207610

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Short term X-ray rms variability of Cyg X-1
T. Gleissner ; J. Wilms ; K. Pottschmidt ; P. Uttley ; M.A. Nowak ; R. Staubert ;
Date 29 Jul 2002
Journal Ph. Durouchoux, Y. Fuchs, and J. Rodriguez (Eds.), New Views on Microquasars, Kolkata: Centre for Space Physics, 2004, p. 46
Subject astro-ph
Affiliation2 and 3), P. Uttley , M.A. Nowak , R. Staubert ( IAA Tuebingen, MPE, ISDC, University of Southampton, MIT
AbstractA linear dependence of the amplitude of broadband noise variability on flux for GBHC and AGN has been recently shown by Uttley & McHardy (2001). We present the long term evolution of this rms-flux-relation for Cyg X-1 as monitored from 1998-2002 with RXTE. We confirm the linear relationship in the hard state and analyze the evolution of the correlation for the period of 1996-2002. In the intermediate and the soft state, we find considerable deviations from the otherwise linear relationship. A possible explanation for the rms-flux-relation is a superposition of local mass accretion rate variations.
Source arXiv, astro-ph/0207610
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