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arXiv 1003.2484astro-ph.HE
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星暴星系中X射线双星与星团的位移

On the displacement of X-ray binaries from star clusters in star-burst galaxies

Zhao-Yu Zuo, Xiang-Dong Li

摘要:

我们用Hurley等人(2000,2002)开发的演化总体合成程序模拟了星暴星系中亮X射线双星从星团中的位移。与Kaaret et al.(2004)一致,我们发现X射线源与其母星系团之间存在显著的空间偏移,并且可以粗略地重建表观X射线亮度与位移的相关性。相关性对簇的基本属性不敏感(例如,初始质量函数的双星)和踢速度赋予新生的紧凑型恒星,除了共同的信封参数。本文给出了当前X射线双星主要参数的分布,这些分布可用于约束未来光学观测中X射线双星形成和演化的模型。

英文摘要:

We have modeled the displacement of luminous X-ray binaries from star clusters in star-burst galaxies with an evolutionary population synthesis code developed by Hurley et al. (2000, 2002). In agreement with Kaaret et al. (2004), we find significant spatial offset of X-ray sources from their parent clusters, and the apparent X-ray luminosity vs. displacement correlation can be roughly reconstructed. The correlation is not sensitive to the fundamental properties of the clusters (e.g., initial mass functions of the binary stars) and the kick velocity imparted to the newborn compact stars, except the common envelope parameter. We present the distributions of the main parameters of the current X-ray binaries, which may be used to constrain the models for the formation and evolution of X-ray binaries with future optical observations.

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