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

2); (2) University of Durham; 3); (3) University of Southampton); L. P. Jenkins (1) ((1) University of Leicester; M. J. Ward (1; M. R. Goad (1; R. S. Warwick (1); T. P. Roberts (1)

arxiv: astro-ph/0412521 · v1 · submitted 2004-12-20 · 🌌 astro-ph

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

T. P. Roberts (1) , R. S. Warwick (1) , M. J. Ward (1 , 2) , M. R. Goad (1 , 3) , L. P. Jenkins (1) ((1) University of Leicester , (2) University of Durham

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(3) University of Southampton)

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keywords x-raycontinuumepicmodelobservationspower-lawsourcespectral

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

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