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arXiv 0809.0584astro-ph
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HESS J0632 +057:新的gamma-ray二进制文件?

HESS J0632+057 : A new gamma-ray binary?

J. A. Hinton, J. L. Skilton, S. Funk, J. Brucker, F. A. Aharonian, G. Dubus, A. Fiasson, Y. Gallant, W. Hofmann, A. Marcowith, O. Reimer

摘要:

高能立体系统(HESS)对银河平面的调查已经确定了相当数量(~40)的银河TeV伽马射线源的存在,其中很大一部分尚未确定。HESS J 0632 +057是这些天体中一小部分本质上是点状(<2' rms)的天体之一,也是仅有的两个仍未被确认的点状源之一。用XMM-牛顿对这个天体的后续观测揭示了一个X射线源,与TeV源和大质量恒星MWC 148相一致,光谱类型为B 0 pe。该源显示出硬光谱,与吸收幂律(Gamma = 1.26 +/- 0.04)一致,并在小时时间尺度上显示出显著的可变性。我们讨论了这种空间重合和隐含的光谱能量分布的对象,并认为这可能是一个新的伽马射线双星系统与这一类的三个已知成员,特别是LS I +61 303的密切相似。需要对该系统进行进一步的X射线、射电和光学观测,以确定HESS J 0632 +057是这类罕见的银河系天体的新成员。

英文摘要:

The High Energy Stereoscopic System (HESS) survey of the Galactic plane has established the existence of a substantial number (~40) of Galactic TeV gamma-ray sources, a large fraction of which remain unidentified. HESS J0632+057 is one of a small fraction of these objects which is point-like in nature(<2' rms), and is one of only two point-like sources that remain unidentified. Follow-up observations of this object with XMM-Newton have revealed an X-ray source coincident with the TeV source and with the massive star MWC 148, of the spectral type B0pe. This source exhibits a hard spectrum, consistent with an absorbed power law with Gamma = 1.26 +/- 0.04, and shows significant variability on hour timescales. We discuss this spatial coincidence and the implied spectral energy distribution of this object and argue that it is likely a new gamma-ray binary system with a close resemblance to the three known members of this class, and in particular to LS I +61 303. Further X-ray, radio and optical observations of this system are needed to firmly establish HESS J0632+057 as a new member of this rare class of Galactic objects.

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