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• W2019976766 endingPage "s278" @default.
• W2019976766 startingPage "S263" @default.
• W2019976766 abstract "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 |$sim$|30 ks each. The XIS signals from a region of radius 3|$^prime$| around the nucleus defined a 2–10 keV flux of 2.1|$times$|10|$^{-11}$|ergs|$^{-1}$|cm|$^{-2}$| attributable to point sources. The 3.2–10 keV 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 |$sim$|20 keV, at a 12-20 keV flux of 4.4|$times$|10|$^{-12}$|ergs|$^{-1}$|cm|$^{-2}$|⁠. 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 M 82. 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)|$times$|10|$^{40}$|ergs|$^{-1}$|⁠. These results are interpreted as Comptonized emission from a black hole of 100–200 solar masses, radiating roughly at the Eddington luminosity." @default.
• W2019976766 created "2016-06-24" @default.
• W2019976766 creator A5019144182 @default.
• W2019976766 creator A5025899056 @default.
• W2019976766 creator A5033311537 @default.
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• W2019976766 creator A5057754812 @default.
• W2019976766 creator A5060279814 @default.
• W2019976766 creator A5087466129 @default.
• W2019976766 creator A5088885646 @default.
• W2019976766 date "2009-01-30" @default.
• W2019976766 modified "2023-10-18" @default.
• W2019976766 title "Suzaku Observations of M 82 X-1 : Detection of a Curved Hard X-Ray Spectrum" @default.
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• W2019976766 doi "https://doi.org/10.1093/pasj/61.sp1.s263" @default.

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