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arXiv 1302.6479astro-ph.HE
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银河平面的XMM-牛顿SSC巡天

The XMM-Newton SSC survey of the Galactic Plane

A. Nebot Gomez-Moran, C. Motch, X. Barcons, F. J. Carrera, M. T. Ceballos, M. Cropper, N. Grosso, P. Guillout, O. Herent, S. Mateos, L. Michel, J. P. Osborne, M… 展开作者

A. Nebot Gomez-Moran, C. Motch, X. Barcons, F. J. Carrera, M. T. Ceballos, M. Cropper, N. Grosso, P. Guillout, O. Herent, S. Mateos, L. Michel, J. P. Osborne, M. Pakull, F. -X. Pineau, J. P. Pye, T. P. Roberts, S. R. Rosen, A. D. Schwope, M. G. Watson, N. Webb

摘要:

许多不同种类的X射线源在高能量下对银河系景观做出了贡献。虽然现在对最明亮的X射线发射体的性质已经有了相当好的了解,但对中低亮度(Lx = 10^27-10^34 erg/s)的X射线源的研究仍然很少,我们的知识主要基于对局部成员的观察。像XMM-牛顿这样的宽视场和高灵敏度X射线望远镜的出现,现在提供了在远距离观察这种低到中等Lx种群的机会。我们报告的结果进行的银河平面调查的XMM-牛顿调查科学中心(SSC)。除了天体物理学目标之外,这项调查的目的是收集低纬度已识别X射线源的代表性样本,这些样本可用于以后统计识别银河系中发现的其他偶然来源。该巡天是基于26个XMM-牛顿观测,在|b| < 20度获得,分布在银河系的大范围内,覆盖4度2的总面积。我们测量的通量极限在软(0.5 - 2 keV)带为2 x 10-15 erg/cm^2/s,在硬(2 - 12 keV)带为1 x 10^-14 erg/cm^2/s。我们总共探测到1319个单独的X射线源。使用光学后续观测辅以交叉相关与大范围的多波长档案目录,我们确定316 X射线源。这构成了在这个通量水平上光谱识别的最大的低纬度X射线源组。大多数已确定的X射线源是光谱类型在A - M范围内的活动日冕,最大距离为~ 1 kpc。已识别的活跃恒星的数量向后期光谱类型增加,在K处达到最大值。(节略)

英文摘要:

Many different classes of X-ray sources contribute to the Galactic landscape at high energies. Although the nature of the most luminous X-ray emitters is now fairly well understood, the population of low-to-medium X-ray luminosity (Lx = 10^27-10^34 erg/s) sources remains much less studied, our knowledge being mostly based on the observation of local members. The advent of wide field and high sensitivity X-ray telescopes such as XMM-Newton now offers the opportunity to observe this low-to-medium Lx population at large distances. We report on the results of a Galactic plane survey conducted by the XMM-Newton Survey Science Centre (SSC). Beyond its astrophysical goals, this survey aims at gathering a representative sample of identified X-ray sources at low latitude that can be used later on to statistically identify the rest of the serendipitous sources discovered in the Milky Way. The survey is based on 26 XMM-Newton observations, obtained at |b| < 20 deg, distributed over a large range in Galactic longitudes and covering a summed area of 4 deg2. The flux limit of our survey is 2 x 10-15 erg/cm^2/s in the soft (0.5 - 2 keV) band and 1 x 10^-14 erg/cm^2/s in the hard (2 - 12 keV) band. We detect a total of 1319 individual X-ray sources. Using optical follow-up observations supplemented by cross-correlation with a large range of multi-wavelength archival catalogues we identify 316 X-ray sources. This constitutes the largest group of spectroscopically identified low latitude X-ray sources at this flux level. The majority of the identified X-ray sources are active coronae with spectral types in the range A - M at maximum distances of ~ 1 kpc. The number of identified active stars increases towards late spectral types, reaching a maximum at K. (abridged)

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