论文标题
黑洞二进制4U 1630-472的Astrosat和Maxi视图在2016年和2018年爆发期间
AstroSat and MAXI view of the Black Hole binary 4U 1630-472 during 2016 and 2018 Outbursts
论文作者
论文摘要
我们在2016年和2018年爆发中介绍了黑洞二进制4U 1630-472的深入光谱和时机分析,如\ textit {astrosat}和\ textit {maxi}所观察到的。使用\ textit {Maxi}对爆发的广泛覆盖范围用于获得硬度强度图(HID)。来源遵循与早期发现一致的“ C”形状的轮廓。根据以前的爆发的隐藏,我们试图在“超级”爆炸和“ Mini”爆炸过程中跟踪来源的演变。我们使用现象学和物理模型对两种爆发的观察结果进行了对宽带能量光谱($ 0.7-20.0 $ keV)的建模。 2016年初爆发未观察到开普勒圆盘签名。但是,该光盘在几个小时内出现,此后温度($ t_ {in} $)$ \ sim $ 1.3 keV和光子指数($γ$)从1.8增加到2.0,而源则在整个\ textIt {AstroSat} 2018爆发活动中处于椎间盘优势状态。根据HID和光谱特性,我们将爆发分类为三个不同的状态 - “规范”硬状态和柔软状态以及中间状态。尽管未检测到未检测到的准周期振荡(QPO),但可以看到RMS沿不同状态的演变。我们使用动力学积分模型拟合观察到的光谱并估计积聚参数。黑洞的质量是使用内圆盘半径,横载仪亮度和两个组件流模型为$ 3-9 $ $ M _ {\ odot} $的质量。最后,我们讨论了我们发现的可能含义。
We present an in-depth spectral and timing analysis of the Black Hole binary 4U 1630-472 during 2016 and 2018 outbursts as observed by \textit{AstroSat} and \textit{MAXI}. The extensive coverage of the outbursts with \textit{MAXI} is used to obtain the Hardness Intensity Diagram (HID). The source follows a `c'-shaped profile in agreement with earlier findings. Based on the HIDs of previous outbursts, we attempt to track the evolution of the source during a `super'-outburst and `mini'-outbursts. We model the broadband energy spectra ($0.7-20.0$ keV) of \textit{AstroSat} observations of both outbursts using phenomenological and physical models. No Keplerian disc signature is observed at the beginning of 2016 outburst. However, the disc appears within a few hours after which it remains prominent with temperature ($T_{in}$) $\sim$ 1.3 keV and increase in photon index ($Γ$) from 1.8 to 2.0, whereas the source was at a disc dominant state throughout the \textit{AstroSat} campaign of 2018 outburst. Based on the HIDs and spectral properties, we classify the outbursts into three different states - the `canonical' hard and soft states along with an intermediate state. Evolution of rms along different states is seen although no Quasi-periodic Oscillations (QPOs) are detected. We fit the observed spectra using a dynamical accretion model and estimate the accretion parameters. Mass of the black hole is estimated using inner disc radius, bolometric luminosity and two component flow model to be $3-9$ $M_{\odot}$. Finally, we discuss the possible implications of our findings.