Reflare in MAXI J1348-630]{Evolution of disc and corona in MAXI J1348-630 during the 2019 reflare: NICER and Insight-HXMT view

Abstract

In this work, using \textit{NICER} and \textit{Insight}-HXMT observations, we present a study of the broadband spectral and timing evolution of the source throughout the first reflare, which occurred about 4 months after the major outburst. Our findings suggest that during the reflare, below a critical luminosity $L_{\mathrm{crit}}\sim 2.5\times 10^{36}$ (D/2.2 kpc)${}^2$ erg s${}^{-1}$, the scale of the corona shrinks in the radial direction, whereas the inner radius of the disk does not change considerably; however, the inner radius of the disk starts to move inward when the source exceeds the critical luminosity. We conclude that at low luminosity the increase in accretion rate only heats up the inner zone of the accretion disc without the transfer of angular momentum which occurs above a certain luminosity.

References in corpus (23)

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• Detection of X-ray spectral state transitions in mini-outbursts of black hole transient GRS 1739-278
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• Detailed analysis on the reflection component for the black hole candidate MAXI J1348-630
• The hybrid radio/X-ray correlation of the black hole transient MAXI J1348-630
• The condensation of the corona for the correlation between the hard X-ray photon index $\Gamma$ and the reflection scaling factor $\Re$ in active galactic nuclei
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• State transitions of GX 339-4 during its outburst rising phase
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Cited by in corpus (3)

• Back to business: SLX 1746--331 after 13 years of silence
• The full evolution of the type-C QPO in MAXI J1348-630 revealed by Insight-HXMT
• A search for optical counterparts in quiescent black hole X-ray transients