Millihertz quasi-periodic oscillations and broad iron line from LMC X-1

被引:18
作者
Alam, Md. Shah [1 ]
Dewangan, G. C. [2 ]
Belloni, T. [3 ]
Mukherjee, D. [2 ]
Jhingan, S. [1 ]
机构
[1] Jamia Millia Islamia, Ctr Theoret Phys, New Delhi 110025, India
[2] IUCAA, Pune 411007, Maharashtra, India
[3] Osserv Astron Brera, INAF, I-23807 Merate, Italy
关键词
accretion; accretion discs; black hole physics; binaries: spectroscopic; stars: individual: LMC X-1; X-rays: stars; BLACK-HOLE CANDIDATE; X-RAY SOURCE; GRS 1915+105; RXTE OBSERVATIONS; GX; 339-4; IGR J17091-3624; XMM-NEWTON; BINARIES; DISCOVERY; SPECTRA;
D O I
10.1093/mnras/stu2048
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study the temporal and energy spectral characteristics of the persistent black hole X-ray binary LMC X-1 using two XMM-Newton and a Suzaku observation. We report the discovery of low-frequency (similar to 26-29 m Hz) quasi-periodic oscillations (QPOs). We also report the variability of the broad iron K alpha line studied earlier with Suzaku. The QPOs are found to be weak with fractional rms amplitude in the similar to 1-2 per cent range and quality factor Q similar to 2-10. They are accompanied by weak red noise or zero-centred Lorentzian components with rms variability at the similar to 1-3 per cent level. The energy spectra consist of three varying components multicolour disc blackbody (kT(in) similar to 0.7-0.9 keV), high-energy power-law tail (Gamma similar to 2.4-3.3) and a broad iron line at 6.4-6.9 keV. The broad iron line, the QPO and the strong power-law component are not always present. The QPOs and the broad iron line appear to be clearly detected in the presence of a strong power-law component. The broad iron line is found to be weaker when the disc is likely truncated and absent when the power-law component almost vanished. These results suggest that the QPO and the broad iron line together can be used to probe the dynamics of the accretion disc and the corona.
引用
收藏
页码:4259 / 4266
页数:8
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