Discovery of the black hole X-ray binary transient MAXIJ1348-630

Abstract

We report the first half-year monitoring of the new Galactic black hole candidate MAXI J1348-630, discovered on 2019 January 26 with the Gas Slit Camera (GSC) on-board MAXI. During the monitoring period, the source exhibited two outburst peaks, where the first peak flux (at T=14 day from the discovery of T =0) was ~4 Crab (2-20 keV) and the second one (at T =132 day) was ~0.4 Crab (2-20 keV). The source exhibited distinct spectral transitions between the high/soft and low/hard states and an apparent "q"-shape curve on the hardness-intensity diagram, both of which are well-known characteristics of black hole binaries. Compared to other bright black hole transients, MAXI J1348-630 is characterized by its low disk-temperature (~0.75 keV at the maximum) and high peak flux in the high/soft state. The low peak-temperature leads to a large innermost radius that is identified as the Innermost Stable Circular Orbit (ISCO), determined by the black hole mass and spin. Assuming the empirical relation between the soft-to-hard transition luminosity (Ltrans) and the Eddington luminosity (LEdd), Ltrans/LEdd ~ 0.02, and a face-on disk around a non-spinning black hole, the source distance and the black hole mass are estimated to be D ~ 4 kpc and ~7 (D/4 kpc) Mo, respectively. The black hole is more massive if the disk is inclined and the black hole is spinning. These results suggest that MAXI J1348-630 may host a relatively massive black hole among the known black hole binaries in our Galaxy.

arXiv comment7 pages, 5 figures, accepted by ApJL

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• NICER observations reveal that the X-ray transient MAXI J1348-630 is a Black Hole X-ray binary
• A giant X-ray dust scattering ring around the black hole transient MAXI J1348-630 discovered with SRG/eROSITA
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• Modeling the kinematics of the decelerating jets from the black hole X-ray binary MAXI J1348$-$630
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• The INTEGRAL view on Black Hole X-ray Binaries
• Detailed analysis on the reflection component for the black hole candidate MAXI J1348-630
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• The hybrid radio/X-ray correlation of the black hole transient MAXI J1348-630
• Broadband Spectral and Timing Properties of MAXI J1348-630 using AstroSat and NICER Observations
• Peculiar disk behaviors of the black hole candidate MAXI J1348-630 in the hard state observed by Insight-HXMT and Swift
• Time-lag between disk and corona radiation leads to hysteresis effect observed in black-hole X-ray binary MAXI J1348-630
• The most variable VVV sources: eruptive protostars, dipping giants in the Nuclear Disc and others
• Rapidly evolving Galactic plane outbursts in NEOWISE: Revisiting the Galactic nova rate with the first all-sky search in the mid-infrared
• MAXI~J1348--630: Estimating the black hole mass and binary inclination using a scaling technique
• A moderate spin for the black hole in X-ray binary MAXI J1348-630 revealed by Insight-HXMT
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• Swift J1728.9-3613 is a black hole X-ray binary: spectral and timing study using NICER
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• Broadband Spectral properties of MAXI J1348--630 using AstroSat Observations
• The spin measurement of MAXI J1348-630 using the Insight-HXMT data
• Multi-wavelength observation of MAXI J1348$-$630 during the outburst in 2019
• Explaining the 'outliers' track in Black Hole X-ray Binaries with the BZ-jet and inner-disk coupling
• A search for optical counterparts in quiescent black hole X-ray transients
• The black hole X-ray binary MAXI J1348$-$630 in quiescence