arXiv 0705.00092007-05astro-ph

第一个未确认的TeV gamma-ray源TeV J2032 +4130的XMM-牛顿观测

XMM-Newton observations of the first unidentified TeV gamma-ray source TeV J2032+4130

D. Horns, A. I. D. Hoffmann, A. Santangelo, F. A. Aharonian, G. P. Rowell

备注：: 5 Pages, 3 Figures, accepted for publication in A&A
DOI：: 10.1051/0004-6361:20066836

摘要：

在天鹅座区域的第一个未被确认的甚高能量伽马射线源（TeV J2032+4130）一直是在其他波长处寻找对应源的密集搜索的对象。用\textit{XMM-Newton}对TeV J 2032 +4130进行了深度（$\approx 50$ ksec）曝光。从数据中减去点源对观测到的TeV J2032+4130的X射线发射的贡献。使用空白天空曝光和XMM-牛顿望远镜覆盖的视场中TeV J2032+4130位置附近的区域来分析点源减去的X射线数据，以搜索漫射X射线发射。发现了一个半高宽为$\approx 12$ arc min的扩展X射线发射区，其发射中心与TeV J 2032 + 4130的位置一致，与TeV J 2032 + 4130的位置和扩展一致的发射能谱可用一个幂函数模型来描述。定律模型，光子指数$Γ=1.5\pm0.2_\mathrm{stat}\pm0.3_\mathrm{sys}$和能量通量积分在2和10 keV之间的$f_{2-10 \mathrm{keV}} \approx 7\cdot 10^{-13}$ ergs/（cm $^2$ s），其低于从TeV J2032+4130观察到的非常高能量的伽马射线通量。我们的结论是，在这次观测中发现的微弱的扩展X射线发射是TeV J2032+4130的X射线对应物。从形式上说，不能排除扩展发射是由于一个不相关的人口微弱，热（$k_BT\approx 10$ keV）未解决的点源，偶然符合的位置和TeV J2032+4130的扩展。我们讨论了我们的研究结果的框架下，强子和轻子伽玛射线的生产方案。

英文摘要：

(abridged) The first unidentified very high energy gamma ray source (TeV J2032+4130) in the Cygnus region has been the subject of intensive search for a counterpart source at other wavelengths. A deep ($\approx 50$ ksec) exposure of TeV J2032+4130 with \textit{XMM-Newton} has been obtained. The contribution of point sources to the observed X-ray emission from TeV J2032+4130 is subtracted from the data. The point-source subtracted X-ray data are analyzed using blank sky exposures and regions adjacent to the position of TeV J2032+4130 in the field of view covered by the XMM-Newton telescopes to search for diffuse X-ray emission. An extended X-ray emission region with a full width half maximum (FWHM) size of $\approx 12$ arc min is found. The centroid of the emission is co-located with the position of TeV J2032+4130.The energy spectrum of the emission coinciding with the position and extension of TeV J2032+4130 can be modeled by a power-law model with a photon index $Γ=1.5\pm0.2_\mathrm{stat}\pm0.3_\mathrm{sys}$ and an energy flux integrated between 2 and 10 keV of $f_{2-10 \mathrm{keV}} \approx 7\cdot 10^{-13}$ ergs/(cm$^2$ s) which is lower than the very high energy gamma-ray flux observed from TeV J2032+4130. We conclude that the faint extended X-ray emission discovered in this observation is the X-ray counterpart of TeV J2032+4130. Formally, it can not be excluded that the extended emission is due to an unrelated population of faint, hot ($k_BT\approx 10$ keV) unresolved point-sources which by chance coincides with the position and extension of TeV J2032+4130. We discuss our findings in the frame of both hadronic and leptonic gamma-ray production scenarios.

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