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 2020 May. 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 ± 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 disc-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 d were obtained, which span ~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 ~5 kpc.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- February 2022
- DOI:
- 10.1093/mnras/stab3463
- arXiv:
- arXiv:2112.02202
- Bibcode:
- 2022MNRAS.510.1258Z
- Keywords:
-
- radio continuum: transients;
- X-rays: binaries;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 5 pages, 3 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society