Broadband variability study of MAXI J1631-479 in its Hard-Intermediate State observed with Insight-HXMT

Abstract

We report the energy-resolved broadband timing analysis of the black hole X-ray transient MAXI J1631-479 during its 2019 outburst from February 11 to April 9, using data from the Insight-Hard X-ray Modulation Telescope (Insight-HXMT), which caught the source from its hard intermediate state to the soft state. Thanks to the large effective area of Insight-HXMT at high energies, we are able to present the energy dependence of fast variability up to ~100 keV. Type-C quasi-periodic oscillations (QPOs) with frequency varying between 4.9 Hz and 6.5 Hz are observed in the 1-100 keV energy band. While the QPO fractional rms increases with photon energy from 1 keV to ~10 keV and remains more or less constant from ~10 keV to ~100 keV, the rms of the flat-top noise first increases from 1 keV to ~8 keV then drops to less than 0.1% above ~30 keV. We suggest that the disappearance of the broadband variability above 30 keV could be caused by the non-thermal acceleration in the Comptonizing plasma. At the same time, the QPOs could be produced by the precession of either a small-scale jet or a hot inner flow model.

arXiv commentTo be published in The Astrophysical Journal

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• AstroSat view of the newly discovered X-ray transient MAXI~J1803--298 in the Hard-intermediate state
• Revisiting the galactic X-ray binary MAXI J1631-479: Implications for high inclination and a massive black hole
• Insight-HXMT Detections of Hard X-ray Tails in Scorpius X-1