Study reveals what causes 'outliers' track in black hole X-ray binaries
Radio/X-ray correlation for the ‘outlier’ track of H1743-322 (in the upper x-axis, the inner-disk luminosity is Lin). The black circles represent the observed radio/X-ray correlation, while the blue squares represent the radio/inner-disk correlation where the inner-disk luminosity is calculated using Equations (4) and (5). Credit: Universe (2022). DOI: 10.3390/universe8060333

Black hole X-ray binaries (BHXB) comprise a stellar-mass black hole accreting gas from a companion star and emitting transient X-ray emission and compact radio jets.

There are strong correlations between the radio luminosity LR and the X-ray luminosity LX of BHXBs. The correlations can mainly be divided into the “standard” track and the “outliers” track.

A research team from the Xinjiang Astronomical Observatory (XAO) of the Chinese Academy of Sciences (CAS) has investigated the contribution of the black hole spin to jet power (Blandford-Znajek jet, hereafter BZ-jet), especially for the magnetic arrested disk, and found that BZ-jet and the inner-disk coupling could account for the “outliers” track in BHXBs.

The study was published in Universe.

The researchers used the quasi-simultaneous radio and X-ray luminosity to probe the accretion of the “outlier” track in two BHXBs, H1743-322 and MAXI J1348-630. The BZ-jet and the inner-disk coupling showed good consistency with the observed radio/X-ray correlation in both sources. This suggests that the BZ-jet may explain the “outlier” tracks of both sources.

While the accretion disk of H1743-322 in outburst could be in the magnetic arrested disk state, there is a lower possibility that a magnetic arrested disk is achieved in MAXI J1348-630 due to its low jet production efficiency.

The difference in inner-disk luminosity to bolometric luminosity ratio for H1743-322 and MAXI J1348-630 was 0.191±0.081 and 0.011±0.005, respectively, which implies that MAXI J1348-630 is in a relatively low state compared with H1743-322. More information: Ning Chang et al, Explaining the ‘Outliers’ Track in Black Hole X-ray Binaries with a BZ-Jet and Inner-Disk Coupling, Universe (2022). DOI: 10.3390/universe8060333 Provided by Chinese Academy of Sciences Citation: Study reveals what causes ‘outliers’ track in black hole X-ray binaries (2022, August 17) retrieved 17 August 2022 from https://phys.org/news/2022-08-reveals-outliers-track-black-hole.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

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