XMM-Newton EPIC observations of the ultraluminous X-ray source NGC 5204 X-1

Details XMM-Newton EPIC observations of the ultraluminous X-ray source NGC 5204 X-1 XMM-Newton EPIC observations of the ultraluminous X-ray source NGC 5204 X-1

2004-12-20

arxiv.org/abs/astro-ph/0412521v1

Mon.Not.Roy.Astron.Soc. 357 (2005) 1363-1369

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, accepted for publication in MNRAS [version including full resolution Figure 1 available from http://www.

Scientific paper

10.1111/j.1365-2966.2005.08758.x

We present the results of two XMM-Newton observations of the ultraluminous X-ray source (ULX) NGC 5204 X-1. The EPIC spectra are well-fit by the standard spectral model of a black-hole X-ray binary, comprising a soft multi-colour disc blackbody component plus a harder power-law continuum. The cool (kT_in ~ 0.2 keV) inner-disc temperature required by this model favours the presence of an intermediate-mass black hole (IMBH) in this system, though we highlight a possible anomaly in the slope of the power-law continuum in such fits. We discuss the interpretation of this and other, non-standard spectral modelling of the data.

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