The evolution of the corona in MAXI J1535−571 through type-C quasi-periodic oscillations with <i>Insight</i>-HXMT
Yuexin Zhang, Mariano Méndez, Federico García, Shuang‐Nan Zhang, Κωνσταντίνος Καρπούζας, D. Altamirano, T. Belloni, Jin‐Lu Qu, Shu Zhang, Lian Tao, Liang Zhang, Y. Huang, Ling-Da Kong, Ruican Ma, Wei Yu, Divya Rawat, Candela Bellavita
Abstract
ABSTRACT 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. For the first time, we show 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 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. Compared 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.