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arXiv 1901.01237astro-ph.HEastro-ph.GA
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小麦哲伦星云的钱德拉深度巡天。III。高质量X射线双星的形成效率

Deep Chandra survey of the Small Magellanic Cloud. III. Formation efficiency of High-Mass X-ray binaries

Vallia Antoniou, Andreas Zezas, Jeremy J. Drake, Carles Badenes, Frank Haberl, Nicholas J. Wright, Jaesub Hong, Rosanne Di Stefano, Terrance J. Gaetz, Knox S. L… 展开作者

Vallia Antoniou, Andreas Zezas, Jeremy J. Drake, Carles Badenes, Frank Haberl, Nicholas J. Wright, Jaesub Hong, Rosanne Di Stefano, Terrance J. Gaetz, Knox S. Long, Paul P. Plucinsky, Manami Sasaki, Benjamin F. Williams, P. Frank Winkler

摘要:

为了研究小麦哲伦云低金属丰度环境下年轻吸积双星的形成效率,我们对小麦哲伦云中的大质量X射线双星进行了最全面的普查。我们总共使用了127个X射线源,在我们的\chandra X射线前瞻性计划(XVP)中进行了检测,并补充了14个额外的(可能和确认的)HMXB,这些HMXB由\cite{2016A&A...586A..81H}确定,属于XVP区域,但在我们的调查中未检测到(9个源)或与OGLE-III目录中至少有一个OB对应物的任何XVP源(5个源)匹配。具体地说,我们研究了HMXB的数量比[N(HMXB)]与OB星的数量{\it(a)}、局部恒星形成率(SFR){ \it(b)}和特定恒星形成爆发期间产生的恒星质量{ \it(c)}的关系,所有这些都是它们的母恒星星族年龄的函数。这些指标中的每一个都发挥着不同的作用,但在所有情况下,我们发现HMXB的形成效率都随着时间的变化(在恒星形成爆发之后)增加,直到$\sim$ 40--60\,Myr,然后逐渐下降。最大形成效率N(HMXB)/SFR为(49 $\pm$ 14)$[10^{-5}~{\rm M_{\odot}/yr}]^{-1}$,与以前估计的20- 60百万年$\sim$的平均形成效率一致。HMXB的频率比$\sim$ 10“,Myr高8倍$\times$,比$\sim$ 260”,Myr高4倍$\times$,即分别在较早和较晚时期。

英文摘要:

We have compiled the most complete census of High-Mass X-ray Binaries (HMXBs) in the Small Magellanic Cloud with the aim to investigate the formation efficiency of young accreting binaries in its low metallicity environment. In total, we use 127 X-ray sources with detections in our \chandra X-ray Visionary Program (XVP), supplemented by 14 additional (likely and confirmed) HMXBs identified by \cite{2016A&A...586A..81H} that fall within the XVP area, but are not either detected in our survey (9 sources) or matched with any XVP source that has at least one OB counterpart in the OGLE-III catalog (5 sources). Specifically, we examine the number ratio of the HMXBs [N(HMXBs)] to {\it (a)} the number of OB stars, {\it (b)} the local star-formation rate (SFR), and {\it (c)} the stellar mass produced during the specific star-formation burst, all as a function of the age of their parent stellar populations. Each of these indicators serves a different role, but in all cases we find that the HMXB formation efficiency increases as a function of time (following a burst of star formation) up to $\sim$40--60\,Myr, and then gradually decreases. The peak formation efficiency N(HMXB)/SFR is (49 $\pm$ 14) $[10^{-5}~{\rm M_{\odot}/yr}]^{-1}$, in good agreement with previous estimates of the average formation efficiency in the broad $\sim$20--60\,Myr age range. The frequency of HMXBs is a factor of 8$\times$ higher than at $\sim$10\,Myr, and 4$\times$ higher than at $\sim$260\,Myr, i.e. at earlier and later epochs, respectively.

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