arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0809.3339astro-ph
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M82 X-1的朱雀观测:硬X射线弯曲谱的探测

Suzaku Observations of M82 X-1 : Detection of a Curved Hard X-ray Spectrum

Ryohei Miyawaki, Kazuo Makishima, Shinya Yamada, Poshak Gandhi, Tsunefumi Mizuno, Aya Kubota, Takeshi Tsuru, Hironori Matsumoto

摘要:

本文报道了2005年10月朱雀星对星暴星系M82超亮X射线源X-1的三次观测,每次曝光量约为30 ks。来自原子核周围半径为3的区域的XIS信号确定了一个2-10 keV的通量为2.1 x 10^-11 erg s-1 cm-2,可归因于点源。3.2-10 keV的光谱比光子指数为1.7的幂律略凸。在所有观测中,HXD还探测到了来自M82的能量高达20 keV的信号,能量为12-20 keV,通量为4.4 x 10^-12 erg s-1 cm-2。HXD谱比XIS谱陡。XIS和HXD光谱可以通过截止幂律模型或类似的弯曲模型联合再现。在探测到的宽带信号中,1/3 ~ 2/3可归因于X-1,其余的可归因于M82中的其它离散源。不管这些污染物的模型如何,X-1的光谱比幂律曲线更弯曲,其辐射热光度为(1.5 - 3)x 10 ^40 erg s-1。这些结果被解释为来自100-200太阳质量的黑洞的康普顿化发射,辐射大致在爱丁顿光度。

英文摘要:

A report is presented on Suzaku observations of the ultra-luminous X-ray source X-1 in the starburst galaxy M82, made three time in 2005 October for an exposure of ~ 30 ks each. The XIS signals from a region of radius 3 around the nucleus defined a 2-10 keV flux of 2.1 x 10^-11 erg s-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 M82 up to ~ 20 keV, at a 12-20 keV flux of 4.4 x 10^-12 erg s-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 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) x 10 ^40 erg 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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