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arXiv 2104.12924astro-ph.HE
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2018年MAXI J1813-095失败突出期间的聚集特性

Accretion Properties of MAXI J1813-095 during its Failed Outburst in 2018

Arghajit Jana, Gaurava K. Jaisawal, Sachindra Naik, Neeraj Kumari, Debjit Chatterjee, Kaushik Chatterjee, Riya Bhowmick, Sandip K. Chakrabarti, Hsiang-Kuang Chang, Dipak Debnath

摘要:

我们介绍了在2018年爆发期间使用{ \it Swift},{ \it NICER}和{ \it NuSTAR}观测对黑洞候选者MAXI~J1813-095进行详细计时和光谱研究的结果。主要通过使用$0.5-10$ keV范围内的{ \it NICER}光变曲线来研究源的定时行为。我们没有发现任何迹象的准周期振荡的功率密度谱的来源。我们进行了光谱分析与组合的磁盘黑体\幂律模型,和一个物理的两个组件的平流(TCAF)模型。从组合的{ \tt磁盘黑体} \{ \tt power-law}模型,我们提取的热和非热通量,光子指数,和内部磁盘温度。我们还发现了光谱中弱反射的证据。我们已经在{ \it NuSTAR}和{ \it Swift}/XRT的宽带频谱上测试了物理TCAF模型。提取了质量吸积率、康普顿云大小和激波强度等参数。我们的研究结果表明,在整个爆发过程中,源保持在硬态,这表明一个'失败'的爆发。利用TCAF模型对黑洞的光谱进行了研究,得到黑洞的质量为$7.4 \pm 1.5$ $M_{\odot}$.我们用{ \tt LAOR}模型计算了Fe K $α$谱线的发射.由此,黑洞的自旋参数被估计为$a^* > 0.76$。根据反射模型估计系统的倾角在$28^{\circ} - 45^{\circ}$的范围内。我们估计源距离为$\sim 6$ kpc。

英文摘要:

We present the results obtained from detailed timing and spectral studies of a black hole candidate MAXI~J1813-095 using {\it Swift}, {\it NICER}, and {\it NuSTAR} observations during its 2018 outburst. The timing behaviour of the source is mainly studied by using {\it NICER} light curves in a $0.5-10$ keV range. We did not find any signature of quasi-periodic oscillations in the power density spectra of the source. We carry out spectral analysis with a combined disk blackbody \& power-law model, and a physical two-component advective flow (TCAF) model. From the combined {\tt disk blackbody} \& {\tt power-law} model, we extracted thermal and non-thermal fluxes, photon index, and inner disk temperature. We also find evidence for weak reflection in the spectra. We have tested the physical TCAF model on a broadband spectrum from {\it NuSTAR} and {\it Swift}/XRT. The parameters like mass accretion rates, the size of the Compton clouds and the shock strength are extracted. Our result shows that the source remained in the hard state during the entire outburst which indicates a `failed' outburst. We estimate the mass of the black hole as $7.4 \pm 1.5$ $M_{\odot}$ from the spectral study with the TCAF model. We use {\tt LAOR} model for the Fe K$α$ line emission. From this, the spin parameter of the black hole is estimated as $a^* > 0.76$. The inclination angle of the system is estimated to be in the range of $28^{\circ} - 45^{\circ}$ from the reflection model. We estimate the source distance to be $\sim 6$ kpc.

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