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NICER observations of the black hole candidate MAXI J0637–430 during the 2019–2020 outburst
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2021-04-29 , DOI: 10.1093/mnras/stab1231
Arghajit Jana 1 , Gaurava K Jaisawal 2 , Sachindra Naik 1 , Neeraj Kumari 1, 3 , Birendra Chhotaray 1, 3 , D Altamirano 4 , R A Remillard 5 , Keith C Gendreau 6
Affiliation  

We present detailed timing and spectral studies of the black hole candidate MAXI J0637–430 during its 2019–2020 outburst using observations with the Neutron Star Interior Composition Explorer (NICER) and the Neil Gehrels Swift Observatory. We find that the source evolves through the soft-intermediate, high-soft, hard-intermediate, and low-hard states during the outburst. No evidence of quasi-periodic oscillations is found in the power-density spectra of the source. Weak variability with fractional rms amplitude ${\lt}5{{\ \rm per\ cent}}$ is found in the softer spectral states. In the hard-intermediate and hard states, high variability with the fractional rms amplitude of ${\gt}20{{\ \rm per\ cent}}$ is observed. The 0.7–10 keV spectra with NICER are studied with a combined disc-black-body and nthcomp model along with the interstellar absorption. The temperature of the disc is estimated to be 0.6 keV in the rising phase and decreased slowly to 0.1 keV in the declining phase. The disc component was not detectable or absent during the low-hard state. From the state-transition luminosity and the inner edge of the accretion flow, we estimate the mass of the black hole to be in the range of 5–12 M⊙, assuming the source distance of d < 10 kpc.

中文翻译:

在 2019-2020 年爆发期间对黑洞候选 MAXI J0637-430 的更好观测

我们使用中子星内部成分探测器 (NICER) 和 Neil Gehrels Swift 天文台的观测,对 MAXI J0637-430 在 2019-2020 年爆发期间的黑洞候选者进行详细的时间和光谱研究。我们发现震源在爆发过程中通过软中间、高软、硬中间和低硬状态演变。在源的功率密度谱中没有发现准周期振荡的证据。在较软的光谱状态中发现具有分数 rms 幅度 ${\lt}5{{\ \rm per\cent}}$ 的弱变化。在硬中间和硬状态下,观察到分数 rms 幅度为 ${\gt}20{{\ \rm per\ cent}}$ 的高度可变性。使用 NICER 的 0.7-10 keV 光谱通过组合的圆盘黑体和 nthcomp 模型以及星际吸收进行研究。盘的温度在上升阶段估计为 0.6 keV,在下降阶段缓慢下降至 0.1 keV。在低硬状态期间,光盘组件不可检测或不存在。从状态转换光度和吸积流的内边缘,我们估计黑洞的质量在 5-12 M⊙ 范围内,假设源距离 d <; 10 kpc。
更新日期:2021-04-29
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