MeerKAT radio detection of the Galactic black hole candidate Swift J1842.5-1124 during its 2020 outburst

Abstract

Swift J1842.5$-$1124 is a transient Galactic black hole X-ray binary candidate, which underwent a new outburst in May 2020. We performed multi-epoch MeerKAT radio observations under the ThunderKAT Large Survey Programme, coordinated with quasi-simultaneous Swift/XRT X-ray observations during the outburst, which lasted nearly a month. We were able to make the first-ever radio detection of this black hole binary with the highest flux density of 229$\pm$31 $\mu$Jy when the source was in the hard state, after non-detection in the radio band in the soft state which occurred immediately after its emergence during the new X-ray outburst. Therefore, its radio and X-ray properties are consistent with the disk-jet coupling picture established in other black hole X-ray binaries. We place the source's quasi-simultaneous X-ray and radio measurements on the radio/X-ray luminosity correlation plane; two quasi-simultaneous radio/X-ray measurements separated by 11 days were obtained, which span $\sim$ 2 dex in the X-ray luminosity. If the source follows the black hole track in the radio/X-ray correlation plane during the outburst, it would lie at a distance beyond $\sim$ 5 kpc.

5 pages, 3 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society

References in corpus (13)

• X-ray Properties of Black-Hole Binaries
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• An online repository of Swift/XRT light curves of GRBs
• The radio/X-ray domain of black hole X-ray binaries at the lowest radio luminosities
• An extremely powerful long-lived superluminal ejection from the black hole MAXI J1820+070
• X-ray outbursts of low-mass X-ray binary transients observed in the RXTE era
• Spectral differences between the jets in `radio loud' and `radio quiet' hard state black hole binaries
• The 2018 outburst of BHXB H1743-322 as seen with MeerKAT
• The hybrid radio/X-ray correlation of the black hole transient MAXI J1348-630
• Radio & X-ray detections of GX 339--4 in quiescence using MeerKAT and Swift
• Radio flaring and dual radio loud/quiet behaviour in the new candidate black hole X-ray binary MAXI J1631-472
• The X-ray view of black-hole candidate Swift J1842.5-1124 during its 2008 outburst

Cited by in corpus (2)

• A Dependable Distance Estimator to Black Hole Low-Mass X-ray Binaries
• Lensed fast radio bursts as a probe of time-varying gravitational potential induced by wave dark matter