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arXiv 2011.09476astro-ph.GAastro-ph.CO
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高质量X射线双星光度函数的金属丰度依赖性

The Metallicity Dependence of the High-Mass X-ray Binary Luminosity Function

Bret D. Lehmer, Rafael T. Eufrasio, Antara Basu-Zych, Keith Doore, Tassos Fragos, Kristen Garofali, Konstantinos Kovlakas, Benjamin J. Williams, Andreas Zezas, Luidhy Santana-Silva

摘要:

我们提出了详细的限制金属依赖的高质量X射线二进制(HMXB)X射线光度函数(XLF)。我们分析了55个活跃的恒星形成星系在D < 30 Mpc的气相金属丰度跨越12 + log(O/H)= 7-9.2的钱德拉数据的~5 Ms。在银河系足迹内,我们的样本总共包含1311个X射线点源,其中约49%预计是HMXB,其余的源可能是低质量X射线双星(LMXB;约22%)和不相关的背景源(约29%)。我们构建了一个模型,成功地表征了整个金属丰度范围内的平均HMXB XLF。我们证明,SFR标准化的HMXB XLF显示出明显的趋势与金属丰度,稳步增加的发光和超铝X射线源(logL(erg/s)= 38-40.5)与金属丰度下降。然而,我们发现低光度(logL(erg/s)= 36-38)HMXB XLF似乎显示出几乎恒定的SFR标度和斜率与金属丰度。我们的模型提供了一个修订的综合LX/SFR与12 + log(O/H)的标度关系和一个新的表征其SFR依赖的随机散射。这种关系的总体趋势与过去基于综合星系发射的研究大致一致;然而,我们的模型表明,这种关系主要是由HMXB XLF的高光度端驱动的。我们的研究结果对二进制人口合成模型,超爱丁顿吸积物体的性质(例如,超铝X射线源),最近的努力,以确定活动星系核候选人在矮星系,和X射线辐射场在宇宙加热的时代在早期宇宙在z > 10。

英文摘要:

We present detailed constraints on the metallicity dependence of the high mass X-ray binary (HMXB) X-ray luminosity function (XLF). We analyze ~5 Ms of Chandra data for 55 actively star-forming galaxies at D < 30 Mpc with gas-phase metallicities spanning 12 + log(O/H) = 7-9.2. Within the galactic footprints, our sample contains a total of 1311 X-ray point sources, of which ~49% are expected to be HMXBs, with the remaining sources likely to be low-mass X-ray binaries (LMXBs; ~22%) and unrelated background sources (~29%). We construct a model that successfully characterizes the average HMXB XLF over the full metallicity range. We demonstrate that the SFR-normalized HMXB XLF shows clear trends with metallicity, with steadily increasing numbers of luminous and ultraluminous X-ray sources (logL(erg/s) = 38-40.5) with declining metallicity. However, we find that the low-luminosity (logL(erg/s) = 36-38) HMXB XLF appears to show a nearly constant SFR scaling and slope with metallicity. Our model provides a revised scaling relation of integrated LX/SFR versus 12 + log(O/H) and a new characterization of its the SFR-dependent stochastic scatter. The general trend of this relation is broadly consistent with past studies based on integrated galaxy emission; however, our model suggests that this relation is driven primarily by the high-luminosity end of the HMXB XLF. Our results have implications for binary population synthesis models, the nature of super-Eddington accreting objects (e.g., ultraluminous X-ray sources), recent efforts to identify active galactic nucleus candidates in dwarf galaxies, and the X-ray radiation fields in the early Universe during the epoch of cosmic heating at z > 10.

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