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arXiv 0810.5134astro-ph
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M82超铝X射线源的一次大爆发

A Major X-ray Outburst from an Ultraluminous X-Ray Source in M82

Philip Kaaret, Hua Feng, Mark Gorski

摘要:

我们探测到了M82的一次大X射线爆发,持续时间为79天,在2-10 keV波段的平均通量为5 E-11 erg cm^-2 s^-1,并且具有很强的可变性。在整个爆发过程中,X射线光谱一直很硬。我们在爆发期间获得了钱德拉观测结果,表明发射来自超铝X射线源X41.4+60。该源在0.3-8 keV波段的未吸收通量为(5.4 +/- 0.2)E-11 erg cm^-2 s^-1,相当于各向同性光度8.5E40 erg/s。该光谱与光子指数为1.55 +/- 0.05的吸收幂律充分拟合。该光子指数与之前在通量为(2.64 +/- 0.14)E-11 erg cm^-2 s^-1时测得的1.61 +/- 0.06非常相似。因此,即使在观察到的最高通量水平下,源似乎也保持在硬态。X41.4+60的X射线光谱和时间数据与处于发光硬态的源和黑洞质量在1到几千个太阳质量范围内的一致。

英文摘要:

We detected a major X-ray outburst from M82 with a duration of 79 days, an average flux of 5E-11 erg cm^-2 s^-1 in the 2-10 keV band, and strong variability. The X-ray spectrum remained hard throughout the outburst. We obtained a Chandra observation during the outburst that shows that the emission arises from the ultraluminous X-ray source X41.4+60. This source has an unabsorbed flux of (5.4 +/- 0.2)E-11 erg cm^-2 s^-1 in the 0.3-8 keV band, equivalent to an isotropic luminosity of 8.5E40 erg/s. The spectrum is adequately fitted with an absorbed power-law with a photon index of 1.55 +/- 0.05. This photon index is very similar to the value of 1.61 +/- 0.06 measured previously while the flux was (2.64 +/- 0.14)E-11 erg cm^-2 s^-1. Thus, the source appears to remain in the hard state even at the highest flux levels observed. The X-ray spectral and timing data available for X41.4+60 are consistent with the source being in a luminous hard state and a black hole mass in the range of one to a few thousand solar masses.

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