Suzaku Observations of M 82 X-1 : Detection of a Curved Hard X-Ray Spectrum

Details Suzaku Observations of M 82 X-1 : Detection of a Curved Hard X-Ray Spectrum Suzaku Observations of M 82 X-1 : Detection of a Curved Hard X-Ray Spectrum

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61s.263m&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.SP1, pp.S263--S278

Physics

4

Balck Hole Physics, Galaxies: Individual (M 82), X-Rays: Stars

Scientific paper

A report is presented on Suzaku observations of the ultra-luminous X-ray source X-1 in the starburst galaxy M 82, made three times in 2005 October for an exposure of ˜30ks each. The XIS signals from a region of radius 3' around the nucleus defined a 2--10keV flux of 2.1 × 10-11erg s-1cm-2 attributable to point sources. The 3.2--10keV spectrum was slightly more convex than a power-law with a photon index of 1.7. In all observations, the HXD also detected signals from M 82 up to ˜20keV, at a 12--20keV flux of 4.4 × 10-12erg s-1cm-2. The HXD spectrum was steeper than that of the XIS. The XIS and HXD spectra can be jointly reproduced by a cutoff power-law model, or similar curved models. Of the detected wide-band signals, 1/3 to 2/3 are attributable to X-1, while the remainder to other discrete sources in M82. Regardless of the modeling of these contaminants, the spectrum attributable to X-1 is more curved than a power-law, with a bolometric luminosity of (1.5--3) × 1040erg s-1. These results are interpreted as Comptonized emission from a black hole of 100--200 solar masses, radiating roughly at the Eddington luminosity.

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