论文标题
硬质量变量的硬X射线光度函数：关节迅速/蝙蝠和Gaia数据
Hard X-ray luminosity functions of cataclysmic variables: Joint Swift/BAT and Gaia data
论文作者
论文摘要
灾难性变量（CVS）是在硬X射线中发射的银河系中最多的人群。它们很可能是造成银河脊和中央银河区域的延长的硬X射线发射的原因。在这里，我们考虑了Gaia也检测到的全套硬X射线快速/BAT调查中检测到的CVS样本，因此具有可靠的距离估计值。使用这些数据，我们得出对每个太阳能质量局部数密度的准确估计（ρ_m= 1.37^{+0.3} _ { - 0.16} x 10^{ - 5} m_sun^{ - 1} { - 1}）和光度密度密度，每个太阳能质量（ρ_L= 8.95^{8.95^{+0.15} _1} 26} s^{ - 1} m_sun^{ - 1}）用于示例中的对象。这些值似乎与综合的银河脊X射线发射和核恒星簇灯光非常吻合。分析差分光度函数dρ_m/d（\ log_ {10} l_x）和dρ_l/d（\ log_ {10} l_x）确认有两个硬X射线发射CVS。中间的极性在亮度l> 10^{33} erg s^{ - 1}以占主导地位，而非磁性CVS和PORAR的含量却少得多，但平均具有较低的亮度。结果，这些人群对观察到的硬X射线光度的贡献几乎是等效的。
Cataclysmic variables (CVs) are the most numerous population among the Galactic objects emitting in hard X-rays. Most probably, they are responsible for the extended hard X-ray emission of the Galactic ridge and the central Galactic regions. Here we consider the sample of CVs detected in the all-sky hard X-ray Swift/BAT survey which were also detected by Gaia and thus have reliable distance estimates. Using these data, we derive accurate estimates for local number density per solar mass (ρ_M = 1.37^{+0.3}_{-0.16} x 10^{-5} M_sun^{-1}) and luminosity density per solar mass (ρ_L = 8.95^{+0.15}_{-0.1} x 10^{26} erg s^{-1} M_sun^{-1}) for objects in the sample. These values appear to be in good agreement with the integrated Galactic ridge X-ray emission and Nuclear Stellar Cluster luminosities. Analysis of the differential luminosity functions dρ_M/d(\log_{10} L_x) and dρ_L/d(\log_{10} L_x) confirms that there are two populations of hard X-ray emitting CVs. Intermediate polars dominate at luminosities L > 10^{33} erg s^{-1}, whereas non-magnetic CVs and polars are much more numerous but have lower luminosities on average. As a consequence, the contribution of these populations to the observed hard X-ray luminosity is almost equivalent.
