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Insight-HXMT observations of the New Black Hole Candidate MAXI J1535-571: timing analysis
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Insight-HXMT observations of the New Black Hole Candidate MAXI J1535-571: timing analysis

Y Huang, J. L Qu, S. N Zhang, Q. C Bu, Y. P Chen, L Tao, S Zhang, F. J Lu, T. P Li, L. M Song, …
arXiv.org
16/08/2018
DOI: https://doi.org/10.48550/arxiv.1808.05318

Abstract

Physics - High Energy Astrophysical Phenomena
We present the X-ray timing results of the new black hole candidate (BHC) MAXI J1535-571 during its 2017 outburst from Hard X-ray Modulation Telescope (Insight-HXMT) observations taken from 2017 September 6 to 23. Following the definitions given by Belloni2010, we find that the source exhibits state transitions from Low/Hard state (LHS) to Hard Intermediate state (HIMS) and eventually to Soft Intermediate state (SIMS). Quasi-periodic oscillations (QPOs) are found in the intermediate states, which suggest different types of QPOs. With the large effective area of Insight-HXMT at high energies, we are able to present the energy dependence of the QPO amplitude and centroid frequency up to 100 keV which is rarely explored by previous satellites. We also find that the phase lag at the type-C QPOs centroid frequency is negative (soft lags) and strongly correlated with the centroid frequency. By assuming a geometrical origin of type-C QPOs, the source is consistent with being a high inclination system.

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