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arXiv 1302.0728astro-ph.HEastro-ph.GA
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Milky Way中持续高质量X射线双星的星群

Population of persistent high mass X-ray binaries in the Milky Way

A. A. Lutovinov, M. G. Revnivtsev, S. S. Tsygankov, R. A. Krivonos

摘要:

我们目前的研究结果,持久的高质量X射线双星(HMXB)在银河系中,从深积分银河系平面调查。这次调查为我们提供了一个新的洞察人口的高质量X射线双星,因为几乎一半的整个样本组成的来源发现的积分。首次证明了大多数持久的HMXB都有超巨星伴星,它们的光度函数在~ 2x 10 ^{36} erg/s附近变陡。我们发现,HMXB的空间密度分布与银河系中的恒星形成率分布相关。HMXB的垂直分布有一个高度h~85 pc的标度,比银河系中年轻恒星的分布略大。我们提出了一个简单的玩具模型,它充分地描述了一般性质的HMXB中,中子星吸积的物质从风的它的同伴(风喂养NS-HMXB人口)。使用精心设计的模型,我们认为,所谓的超巨星快速X射线瞬变,最近公认的子样本的HMXB的耀斑活动,可能与磁逮捕他们的吸积。

英文摘要:

We present results of the study of persistent high mass X-ray binaries (HMXBs) in the Milky Way, obtained from the deep INTEGRAL Galactic plane survey. This survey provides us a new insight into the population of high mass X-ray binaries because almost half of the whole sample consists of sources discovered with INTEGRAL. It is demonstrated for the first time that the majority of persistent HMXBs have supergiant companions and their luminosity function steepens somewhere around ~2x10^{36} erg/s. We show that the spatial density distribution of HMXBs correlates well with the star formation rate distribution in the Galaxy. The vertical distribution of HMXBs has a scale-height h~85 pc, that is somewhat larger than the distribution of young stars in the Galaxy. We propose a simple toy model, which adequately describes general properties of HMXBs in which neutron stars accrete a matter from the wind of the its companion (wind-fed NS-HMXBs population). Using the elaborated model we argue that a flaring activity of so-called supergiant fast X-ray transients, the recently recognized sub-sample of HMXBs, is likely related with the magnetic arrest of their accretion.

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