论文标题
表征X射线中Nova样灾难性变量的对流热流：BZ CAM和V592 CAS的情况
Characterizing the Advective Hot Flows of Nova-Like Cataclysmic Variables in the X-rays: The case of BZ Cam and V592 Cas
论文作者
论文摘要
我们提出了Rosat PSPC，Swift XRT和Nostar FPMA/B数据的联合光谱分析，其中NOVA样（NL）灾难性变量（CVS），BZ CAM和V592 Cas在0.1-78.0 KeV频段中。碰撞平衡的等离子体模型无法建模6.0-7.0铁线复合物和连续体，$χ^2_ν$大于2.0。我们的结果表明，对于BZ CAM和V592 CAS，温度分别为8.2-9.4 KEV，温度分别为8.2-9.4 KeV，温度为8.2-9.4 keV。 He样和H样铁电离线的质心不如NEI条件所预期的平衡值。我们发现功率法光谱成分揭示了具有1.50-1.87的光子指数的散射和构成的存在。我们在BZ凸轮的H样铁线中检测到P Cygni轮廓，转化为4500-8700 km S $^{ - 1} $的流出，与光学和紫外线中的快风一致。这是在X射线中首次从积聚的简历中检测到如此快的准直流。在6.2-6.5 keV附近，铁K $α$线被发现揭示了两个来源的反射效应。我们研究了宽带噪声，并发现BZ CAM中的光学厚磁盘截断和V592 CAS与过渡到对流热流结构一致。 V592 CAS还以1.4 $^{+2.6} _ { - 0.3} $ MHz表现出准周期振荡。通常，我们发现两个NLS在低辐射效率下对对流热积聚流的预期的光谱和噪声特性。
We present a joint spectral analysis of ROSAT PSPC, Swift XRT, and NuSTAR FPMA/B data of the nova-like (NL) cataclysmic variables (CVs), BZ Cam and V592 Cas in the 0.1-78.0 keV band. Plasma models of collisional equilibrium fail to model the 6.0-7.0 iron line complex and continuum with $χ^2_ν$ larger than 2.0. Our results show nonequilibrium ionization (NEI) conditions in the X-ray plasma with temperatures of 8.2-9.4 keV and 10.0-12.9 keV for BZ Cam and V592 Cas, respectively. The centroids of He-like and H-like iron ionization lines are not at their equilibrium values as expected from NEI conditions. We find power law spectral components that reveal the existence of scattering and Comptonization with a photon index of 1.50-1.87. We detect a P Cygni profile in the H-like iron line of BZ Cam translating to outflows of 4500-8700 km s$^{-1}$ consistent with the fast winds in the optical and UV. This is the first time such a fast collimated outflow is detected in the X-rays from an accreting CV. An Iron K$α$ line around 6.2-6.5 keV is found revealing the existence of reflection effects in both sources. We study the broadband noise and find that the optically thick disk truncates in BZ Cam and V592 Cas consistent with transition to an advective hot flow structure. V592 Cas also exhibits a quasi-periodic oscillation at 1.4$^{+2.6}_{-0.3}$ mHz. In general, we find that the two NLs portray spectral and noise characteristics as expected from advective hot accretion flows at low radiative efficiency.
