The hybrid radio/X-ray correlation of the black hole transient MAXI J1348-630

Abstract

Black hole low mass X-ray binaries in their hard spectral state are found to display two different correlations between the radio emission from the compact jets and the X-ray emission from the inner accretion flow. Here, we present a large data set of quasi-simultaneous radio and X-ray observations of the recently discovered accreting black hole MAXI J1348-630 during its 2019/2020 outburst. Our results span almost six orders of magnitude in X-ray luminosity, allowing us to probe the accretion-ejection coupling from the brightest to the faintest phases of the outburst. We find that MAXI J1348-630 belongs to the growing population of outliers at the highest observed luminosities. Interestingly, MAXI J1348-630 deviates from the outlier track at $L_{\mathrm{X}}\lesssim 7\times 10^{35}(D/2.2\mathrm{kpc}{)}^2$ erg s${}^{-1}$ and ultimately rejoins the standard track at $L_{\mathrm{X}}\simeq 10^{33}(D/2.2\mathrm{kpc}{)}^2$ erg s${}^{-1}$, displaying a hybrid radio/X-ray correlation, observed only in a handful of sources. However, for MAXI J1348-630 these transitions happen at luminosities much lower than what observed for similar sources (at least an order of magnitude). We discuss the behaviour of MAXI J1348-630 in light of the currently proposed scenarios and we highlight the importance of future deep monitorings of hybrid correlation sources, especially close to the transitions and in the low luminosity regime.

6 pages, 1 figure. Accepted for publication in MNRAS Letters

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• MAXI~J1348--630: Estimating the black hole mass and binary inclination using a scaling technique
• Reflare in MAXI J1348-630]{Evolution of disc and corona in MAXI J1348-630 during the 2019 reflare: NICER and Insight-HXMT view
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• The 2019 outburst of AMXP SAX J1808.4-3658 and radio follow up of MAXI J0911-655 and XTE J1701-462
• Investigating the nature and properties of MAXI J1810-222 with radio and X-ray observations
• MeerKAT radio detection of the Galactic black hole candidate Swift J1842.5-1124 during its 2020 outburst
• Evaluating the jet/accretion coupling of Aql X-1: probing the contribution of accretion flow spectral components
• The Origin of Radio Emission in Black Hole X-ray Binaries
• The origin of UV/optical emission in the black hole low-mass X-ray binary Swift J1753.5-0127
• The Accretion-Ejection Connection in the Black Hole X-ray Binary MAXI J1820$+$070
• Explaining the 'outliers' track in Black Hole X-ray Binaries with the BZ-jet and inner-disk coupling
• The black hole X-ray binary MAXI J1348$-$630 in quiescence