Spectral variability of the nucleus of M33 in a Chandra-ACIS observation

Details Spectral variability of the nucleus of M33 in a Chandra-ACIS observation Spectral variability of the nucleus of M33 in a Chandra-ACIS observation

2002-10-08

arxiv.org/abs/astro-ph/0210174v1

Astrophys.J. 583 (2003) 758-764

Astronomy and Astrophysics

Astrophysics

Accepted for publication on The Astrophysical Journal. 14 pages, 5 figures

Scientific paper

10.1086/345505

We have analyzed a 90 ksec long observation of the bright nucleus of M33 made with Chandra/ACIS. We detected low-amplitude (~sim10%) highly significant variability on timescales of ~5000 sec. We also find associated spectral variability. The two main spectral components (a power-law with \Gamma~2 and a multicolor disk -MCD- with kT~0.9-1.2 keV) vary in relative flux. The MCD temperature also increases with increasing MCD flux. The pattern of variability is reminiscent of (but not identical to) galactic black hole binaries. A ~5 M$_{\odot}$ accreting black hole may explain this source.

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