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arXiv 2006.09077astro-ph.HE
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MAXI J1535-571中非共振C型QPO的PDKEEPAAA观测

AstroSat Observation of Non-Resonant Type-C QPOs in MAXI J1535-571

D. Chatterjee, D. Debnath, A. Jana, J. -R. Shang, S. K. Chakrabarti, H. -K. Chang, A. Banerjee, A. Bhattacharjee, K. Chatterjee, R. Bhowmick, S. K. Nath

摘要:

银河系瞬态黑洞候选者(BHC)MAXI J1535-571于2017年9月2日由{ \it MAXI}/GSC和{ \it Swift}/BAT仪器同时发现。印度第一颗多波长天文任务卫星{ \it AstroSat}在2017-18爆发的上升阶段也观测到了它。我们使用{ \it AstroSat}的大面积X射线正比计数器(LAXPC)在$3-40$ ~keV能量范围内的数据对2017年9月12日至17日期间的源进行光谱和时间分析,以推断源的吸积流性质。频谱分析是用基于物理双组分平流(TCAF)解的{ \it拟合}文件完成的。从TCAF模式拟合的物理流参数变化的性质,我们得出结论,并确认源在我们的分析期间处于中间光谱状态。在$\sim 1.75-2.81$ ~Hz的频率范围内观察到尖锐的C型准周期振荡(QPO)。为了更好地理解这些C类QPO的性质和演化,我们对它们的功率密度谱进行了动态研究。我们还从激波振荡模型的角度研究了这些QPO的起源。我们发现,不满足非耗散冲击的Rankine-Hugoniot条件,而不是它们的共振振荡是所观察到的C型QPO的原因。

英文摘要:

Galactic transient black hole candidate (BHC) MAXI J1535-571 was discovered on 2017 September 02 simultaneously by {\it MAXI}/GSC and {\it Swift}/BAT instruments. It has also been observed by India's first multi-wavelength astronomy-mission satellite {\it AstroSat}, during the rising phase of its 2017-18 outburst. We make both the spectral and the temporal analysis of the source during 2017 September 12-17 using data of {\it AstroSat}'s Large Area X-ray Proportional Counter (LAXPC) in the energy range of $3-40$~keV to infer the accretion flow properties of the source. Spectral analysis is done with the physical two-component advective flow (TCAF) solution-based {\it fits} file. From the nature of the variation of the TCAF model fitted physical flow parameters, we conclude and confirm that the source was in the intermediate spectral state during our analysis period. We observe sharp type-C quasi-periodic oscillations (QPOs) in the frequency range of $\sim 1.75-2.81$~Hz. For a better understanding of the nature and evolution of these type-C QPOs, a dynamic study of the power density spectra is done. We also investigate the origin of these QPOs from the shock oscillation model. We find that non-satisfaction of Rankine-Hugoniot conditions for non-dissipative shocks and not their resonance oscillations is the cause of the observed type-C QPOs.

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