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29 March 2024
 
  » arxiv » astro-ph/0409416

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Is M82 X-1 Really An Intermediate-Mass Black Hole? X-ray Spectral and Timing Evidence
Ralph Fiorito ; Lev Titarchuk ;
Date 16 Sep 2004
Journal Astrophys.J. 614 (2004) L113-L116
Subject astro-ph
AffiliationUMD/GSFC) and Lev Titarchuk (GMU/NRL/GSFC
AbstractUltra-luminous X-ray sources (ULXs) with apparent luminosities up to 100’s of times the Eddington luminosity for a neutron star have been discovered in external galaxies. The existence of intermediate mass black holes has been proposed to explain these sources. We present evidence for an intermediate-mass black hole in the ULX M82 X-1 based on the spectral features and timing (QPO) properties of the X-radiation from this source. We revisited XMM Newton and RXTE data for M82 X-1 obtained in 2001 and 1997 for XMM and RXTE respectively. We show for these observations that the source is either in transition or in a high/soft state with photon spectral indices 2.1 and 2.7 respectively. We confirm the early determination of the QPO frequency ~ 55 mHz in this source by Strohmayer & Mushotzky and identify this as the low frequency QPO for the source. We apply a new method to determine the BH mass of M82 X-1. The method uses the index-QPO low frequency correlation that has been recently been established in galactic black hole candidates GRS 1915+105, XTE J1550-564, 4U 1630-47 and others. Using scaling arguments and the correlation derived from consideration of galactic BHs, we conclude that M82 X-1 is an intermediate BH with a mass of the order of 1000 solar masses.
Source arXiv, astro-ph/0409416
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