Measuring the distance to the black hole candidate X-ray binary MAXI J1348-630 using HI absorption

Abstract

We present HI absorption spectra of the black hole candidate X-ray binary (XRB) MAXI J1348-630 using the Australian Square Kilometre Array Pathfinder (ASKAP) and MeerKAT. The ASKAP HI spectrum shows a maximum negative radial velocity (with respect to the local standard of rest) of $-31\pm 4$ km s${}^{-1}$ for MAXI J1348-630, as compared to $-50\pm 4$ km s${}^{-1}$ for a stacked spectrum of several nearby extragalactic sources. This implies a most probable distance of $2.2_{-0.6}^{+0.5}$ kpc for MAXI J1348-630, and a strong upper limit of the tangent point distance at $5.3\pm 0.1$ kpc. Our preferred distance implies that MAXI J1348-630 reached $17\pm 10$ % of the Eddington luminosity at the peak of its outburst, and that the source transited from the soft to the hard X-ray spectral state at $2.5\pm 1.5$ % of the Eddington luminosity. The MeerKAT HI spectrum of MAXI J1348-630 (obtained from the older, low-resolution 4k mode) is consistent with the re-binned ASKAP spectrum, highlighting the potential of the eventual capabilities of MeerKAT for XRB spectral line studies.

Accepted for publication in MNRAS Letters

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• The 2018 outburst of BHXB H1743-322 as seen with MeerKAT
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• Modeling the kinematics of the decelerating jets from the black hole X-ray binary MAXI J1348$-$630
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• Transitions and Origin of the Type-B Quasi-Periodic Oscillation in the Black Hole X-ray Binary MAXI~ J1348--630
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• Radio observations of the Black Hole X-ray Binary EXO 1846-031 re-awakening from a 34-year slumber
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• Broadband Spectral properties of MAXI J1348--630 using AstroSat Observations
• Global Accretion Properties of Black Hole X-Ray Binaries: A Phenomenological Perspective
• The spin measurement of MAXI J1348-630 using the Insight-HXMT data
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• Multi-wavelength observation of MAXI J1348$-$630 during the outburst in 2019
• Explaining the 'outliers' track in Black Hole X-ray Binaries with the BZ-jet and inner-disk coupling
• A search for optical counterparts in quiescent black hole X-ray transients
• The black hole X-ray binary MAXI J1348$-$630 in quiescence
• On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow