标题： 通过光学侦察校准X射线双星光度函数 I. M83的情况 显示英文标题

标题： Calibrating X-ray binary luminosity functions via optical reconnaissance I. The case of M83

摘要： 在Chandar等人(2020)最近工作的基础上，我们通过一种新方法构建了附近形成恒星的星系M83中不同类别的X射线双星(XRB)供体的X射线光度函数(XLFs)：而不是根据X射线源数量与恒星质量及恒星形成率的标度来分类低质量与高质量XRB，我们利用多波段哈勃空间望远镜成像数据，根据候选对应体在光学颜色-星等图上的位置或其宿主星团的年龄，将每个钱德拉探测到的紧凑X射线源分类为低质量(X射线源质量<~ 3个太阳质量)、高质量(X射线源质量>~ 8个太阳质量)或中等质量XRB。 除了标准的(单个和/或截断)幂律函数形状外，我们还用Schechter函数近似得到的XLFs。 我们在高质量XRB XLF中识别出一个边缘显著(在1到2 sigma水平)的指数下降，在logLx ~ 38.48^{+0.52}_{-0.33}(以log CGS单位计算)处。 相反，低质量和中等质量XRB的XLFs以及M83的总XLF在统计上与单个幂律采样一致。 我们的方法表明低质量和可能中等质量XRB对M83总XRB XLF有不可忽略的贡献，即在20%到50%之间，这与基于X射线的XLFs大致一致。 更一般地说，我们警告不要过度依赖来自X射线发射超新星遗迹对M83已发表的基于X射线的XLFs的污染，以及可能所有活跃形成恒星的星系。 显示英文摘要

摘要： Building on recent work by Chandar et al. (2020), we construct X-ray luminosity functions (XLFs) for different classes of X-ray binary (XRB) donors in the nearby star-forming galaxy M83 through a novel methodology: rather than classifying low- vs. high-mass XRBs based on the scaling of the number of X-ray sources with stellar mass and star formation rate, respectively, we utilize multi-band Hubble Space Telescope imaging data to classify each Chandra-detected compact X-ray source as a low-mass (i.e. donor mass <~ 3 solar masses), high-mass (donor mass >~ 8 solar masses) or intermediate-mass XRB based on either the location of its candidate counterpart on optical color-magnitude diagrams or the age of its host star cluster. In addition to the the standard (single and/or truncated) power-law functional shape, we approximate the resulting XLFs with a Schechter function. We identify a marginally significant (at the 1-to-2 sigma level) exponential downturn for the high-mass XRB XLF, at logLx ~ 38.48^{+0.52}_{-0.33} (in log CGS units). In contrast, the low- and intermediate-mass XRB XLFs, as well as the total XLF of M83, are formally consistent with sampling statistics from a single power-law. Our method suggests a non-negligible contribution from low- and possibly intermediate-mass XRBs to the total XRB XLF of M83, i.e. between 20 and 50%, in broad agreement with X-ray based XLFs. More generally, we caution against considerable contamination from X-ray emitting supernova remnants to the published, X-ray based XLFs of M83, and possibly all actively star-forming galaxies.