Discovery and state transitions of the new Galactic black hole candidate MAXI J1535-571

Abstract

We report on the detection and subsequent X-ray monitoring of the new Galactic black hole candidate MAXI J1535-571 with the MAXI/GSC. Afterthe discovery on 2017 September 2 made independently with MAXI and the Swift/BAT, the source brightened gradually, and in a few weeks, reached the peak intensity of ~5 Crab, or ~1.6 x 10^{-7} erg cm^{-2} s^{-1} in terms of the 2--20 keV flux. On the initial outburst rise, the X-ray spectrum was described by a power-law model with a photon index of ~2, while after a hard-to-soft transition which occurred on September 18, the spectrum required a disk blackbody component in addition. At around the flux peak, the 2-8 keV and 15-50 keV light curves showed quasi-periodic and anti-correlated fluctuations with an amplitude of 10--20%, on a time scale of ~1-day. Based on these X-ray properties obtained with the MAXI/GSC, we discuss the evolution of the spectral state of this source, and give constraints on its system parameters.

arXiv commentSubmitted to Publications of the Astronomical Society of Japan on Apri 3 2018, Accepted by PASJ on July 21 2018

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Cited by in corpus (16)

• Disk-jet coupling in the 2017/2018 outburst of the Galactic black hole candidate X-ray binary MAXI J1535-571
• AstroSat view of MAXI J1535-571: broadband spectro-temporal features
• X-ray and Optical Monitoring of State Transitions in MAXI J1820+070
• Evolution of X-Ray Properties of MAXI J1535-571: Analysis with the TCAF Solution
• Rapid compact jet quenching in the Galactic black hole candidate X-ray binary MAXI J1535-571
• Swift Observations of the bright uncatalogued X-ray transient MAXI J1535-571
• The comptonizing medium of the black-hole X-ray binary MAXI~J1535$-$571 through type-C quasi-periodic oscillations
• A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares
• A spectral and timing study of MAXI J1535-571, based on Swift/XRT, XMM-Newton and NICER observations obtained in fall 2017
• Studying the Reflection Spectra of the New Black Hole X-ray Binary Candidate MAXI J1631-479 Observed by NuSTAR: A Variable Broad Iron Line Profile
• The spins of the Galactic black holes in MAXI J1535-571 and 4U 1630-472 from Insight-HXMT
• A broadband spectral-timing study of QPOs in the bright black hole X-ray binary Swift J1727.8-1613
• MAXI : Monitor of All-sky X-ray Image
• MAXI J1535-571 2017 outburst Seen by INTEGRAL/SPI and Investigating the Origin of Its Hard Tail
• QPOML: A Machine Learning Approach to Detect and Characterize Quasi-Periodic Oscillations in X-ray Binaries
• Observational Biases and Improved Modelling of Off-axis Relativistic Jets