The evolution of the corona in MAXI J1535-571 through type-C quasi-periodic oscillations with Insight-HXMT

Type-C quasi-periodic oscillations (QPOs) in black hole X-ray transients can appear when the source is in the low-hard and hard-intermediate states. The spectral-timing evolution of the type-C QPO in MAXI J1535-571 has been recently studied with Insight-HXMT. Here we fit simultaneously the time-aver...

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Published inarXiv.org
Main Authors Zhang, Yuexin, Méndez, Mariano, García, Federico, Zhang, Shuang-Nan, Karpouzas, Konstantinos, Altamirano, Diego, Belloni, Tomaso M, Qu, Jinlu, Zhang, Shu, Lian Tao, Zhang, Liang, Huang, Yue, Kong, Lingda, Ma, Ruican, Yu, Wei, Rawat, Divya, Candela Bellavita
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.03.2022
Subjects
Energy spectra
Evolution
Phase lag
Quasi-Periodic Oscillations
Radio observation
Time dependence
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Summary:Type-C quasi-periodic oscillations (QPOs) in black hole X-ray transients can appear when the source is in the low-hard and hard-intermediate states. The spectral-timing evolution of the type-C QPO in MAXI J1535-571 has been recently studied with Insight-HXMT. Here we fit simultaneously the time-averaged energy spectrum, using a relativistic reflection model, and the fractional rms and phase-lag spectra of the type-C QPOs, using a recently developed time-dependent Comptonization model when the source was in the intermediate state. We show, for the first time, that the time-dependent Comptonization model can successfully explain the X-ray data up to 100 keV. We find that in the hard-intermediate state the frequency of the type-C QPO decreases from 2.6 Hz to 2.1 Hz, then increases to 3.3 Hz, and finally increases to ~ 9 Hz. Simultaneously with this, the evolution of corona size and the feedback fraction (the fraction of photons up-scattered in the corona that return to the disc) indicates the change of the morphology of the corona. Comparing with contemporaneous radio observations, this evolution suggests a possible connection between the corona and the jet when the system is in the hard-intermediate state and about to transit into the soft-intermediate state.
ISSN:2331-8422