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arXiv 1202.4728astro-ph.HE
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凤凰矮星系中高质量X射线双星的搜寻

The Search for High-Mass X-ray Binaries in the Phoenix Dwarf Galaxy

E. S. Bartlett, M. J. Coe, F. Haberl, V. A. McBride, R. H. D. Corbet

摘要:

我们报告的第一个X射线图像的凤凰矮星系,采取了\emph{XMM-Newton}在2009年7月。这个本星系群矮星系与小麦哲伦星云(SMC)有相似之处,包括$\sim$ 5千万年前的恒星形成爆发。SMC有丰富的高质量X射线双星(HMXB),所以我们已经调查了HMXB人口的可能性,在凤凰的意图,进一步了解的HMXB恒星形成率的关系。来自欧洲光子成像照相机组合的数据被用来利用欧洲光子成像照相机硬度比以及与光学和射电星表的相关性来区分不同的源类别(前景星、背景星系、活动星系核和超新星遗迹)。在视场中的81个X射线源中,6个是前景恒星,4个是星系,1个是活动星系核。其余的源与光学对应的log($\frac{f_X}{f_{opt}}$)一致的活动星系核在本地宇宙。对视野中的五个源的进一步研究表明,它们都是背景活动星系核。它们位于与凤凰有关的气体云后面,这使它们成为进一步探测该地区金属丰度的可能工具。我们目前在凤凰城没有发现任何HMXB的证据。这就排除了X射线持久超巨星X射线双星的存在。然而,Be/X射线双星的瞬态性质意味着我们不能排除这些来源的人口,但可以得出结论,它是不广泛的。

英文摘要:

We report on the first X-ray images of the Phoenix dwarf galaxy, taken with \emph{XMM-Newton} in July 2009. This local group dwarf galaxy shares similarities with the Small Magellanic Cloud (SMC) including a burst of star formation $\sim$50 Myr ago. The SMC has an abundance of High Mass X-ray Binaries (HMXBs) and so we have investigated the possibility of an HMXB population in Phoenix with the intention of furthering the understanding of the HMXB-star formation rate relation. The data from the combined European Photon Imaging Cameras (EPIC) were used to distinguish between different source classes (foreground stars, background galaxies, AGN and supernova remnants) using EPIC hardness ratios and correlations with optical and radio catalogues. Of the 81 X-ray sources in the field of view, six are foreground stars, four are galaxies and one is an AGN. The remaining sources with optical counterparts have log($\frac{f_X}{f_{opt}}$) consistent with AGN in the local universe. Further investigation of five sources in the field of view suggests they are all background AGN. Their position behind the gas cloud associated with Phoenix makes them a possible tool for further probing the metallicity of this region. We find no evidence for any HMXBs in Phoenix at this time. This rules out the existence of the X-ray persistent supergiant X-ray binary systems. However the transient nature of the Be/X-ray binaries means we cannot rule out a population of these sources but can conclude that it is not extensive.

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