The X-ray source content of the XMM-Newton Galactic plane survey

The X-ray source content of the XMM-Newton Galactic plane survey
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XMM-牛顿银河平面巡天的X射线源内容

DOI:
10.1051/0004-6361/200913570
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发表时间:
2010
影响因子:
6.5
通讯作者:
Motch C
Motch C
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Motch C

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我们报告了由XMM-牛顿测量科学中心开展的一项光学运动的结果,其具体目标是在XMM-牛顿银河系平面测量中识别最亮的X射线源。除了在ESO-VLT和ESO-3.6米获得的光度和光谱观测外,我们还使用了与2XMMi、USNO-B1.0、2MASS和Glimse星表的交叉相关来推进鉴定过程。在30个阳性或初步确定的X射线源中,活动日冕占16个,并显示出最软的X射线光谱。许多已确定的硬X射线源与大质量恒星有关,它们可能是双星系统的成员,发射的中等X射线亮度为1032−34erg S-1。其中包括:(I)一颗非常被吸收的超发光恒星,其X射线/光谱光谱和光度与η船底座相当;(Ii)一颗新的X射线选择的WN8Wolf-Rayet星,其中的大部分X射线辐射可能来自风碰撞双星;(Iii)一颗新的Be/X射线星,属于日益增长的γ-CaS类似物;以及(Iv)一颗最近通过积分发现的可能的超巨型X射线双星。其中一个来源,XGPS-25,具有中等光学光度的对应物,显示出HeIIλ4686和Bowen CIII-Niii发射线,这表明这可能是一个静止的或被X射线屏蔽的低质量X射线双星,尽管它的X射线性质也可能与一种罕见的激变变星(CV)一致。我们还报告了三个新的CV的发现,其中一个可能是一个显示出很强的X射线可变性的磁性系统。软(0.4-2.0 keV)带Logn(>S)的−和LogS曲线完全由流量范围为1×10-13到1×10-14erg cm-2s-1的活动星主导。在2 keV以上还发现了几个活动的日冕,这表明RS CVn双星群对硬X射线源群的贡献很大。总体而言,我们能够识别出流量范围在1×10-12到1×10-13  cm-2s-1的很大一部分硬(2-10 keV)X射线源,其速度与预期的单独银河系贡献一致。
We report the results of an optical campaign carried out by the XMM-Newton Survey Science Centre with the specific goal of identifying the brightest X-ray sources in the XMM-Newton Galactic plane survey. In addition to photometric and spectroscopic observations obtained at the ESO-VLT and ESO-3.6 m, we used cross-correlations with the 2XMMi, USNO-B1.0, 2MASS, and GLIMPSE catalogues to advance the identification process. Active coronae account for 16 of the 30 positively or tentatively identified X-ray sources and exhibit the softest X-ray spectra. Many of the identified hard X-ray sources are associated with massive stars, possible members of binary systems and emitting at intermediate X-ray luminosities of 1032−34erg s-1. Among these are (i) a very absorbed, likely hyper-luminous star with X-ray/optical spectra and luminosities comparable to those ofηCarina; (ii) a new X-ray-selected WN8 Wolf-Rayet star in which most of the X-ray emission probably arises from wind collision in a binary; (iii) a new Be/X-ray star belonging to the growing class ofγ-Cas analogues; and (iv) a possible supergiant X-ray binary of the kind discovered recently by INTEGRAL. One of the sources, XGPS-25, has a counterpart of moderate optical luminosity that exhibits HeIIλ4686 and Bowen CIII-NIII emission lines, suggesting that this may be a quiescent or X-ray shielded low mass X-ray binary, although its X-ray properties might also be consistent with a rare kind of cataclysmic variable (CV). We also report the discovery of three new CVs, one of which is a likely magnetic system displaying strong X-ray variability. The soft (0.4–2.0 keV) band logN(>S) − logScurve is completely dominated by active stars in the flux range of 1 × 10-13to 1 × 10-14erg cm-2s-1. Several active coronae are also detected above 2 keV suggesting that the population of RS CVn binaries contributes significantly to the hard X-ray source population. In total, we are able to identify a large fraction of the hard (2–10 keV) X-ray sources in the flux range of 1 × 10-12to 1 × 10-13erg cm-2s-1with Galactic objects at a rate consistent with what is expected for the Galactic contribution alone.
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