Jet-dominated quiescent state in black hole X-ray binaries: the cases of A0620--00 and XTE J1118+480

Abstract

The radiative mechanism of the black hole X-ray transients (BHXTs) in their quiescent states (defined as the 2-10 keV X-ray luminosity $\le 10^{34}\mathrm{erg}{\mathrm{s}}^{-1}$) remains unclear. In this work, we investigate the quasi-simultaneous quiescent state spectrum (including radio, infrared, optical, ultraviolet and X-ray) of two BHXTs, A0620--00 and XTE J1118+480. We find that, these two sources can be well described by a coupled accretion -- jet model. More specifically, most of the emission (radio up-to infrared, and the X-ray waveband) comes from the collimated relativistic jet. Emission from hot accretion flow is totally insignificant, and it can only be observed in mid-infrared (the synchrotron peak). Emission from the outer cold disc is only evident in UV band. These results are consistent with our previous investigation on the quiescent state of V404 Cyg, and confirm that the quiescent state is jet-dominated.

11 pages, 1 figure, accepted for publication in Research in Astronomy and Astrophysics

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• Polarized synchrotron emission in quiescent black hole X-ray transients
• Swift/XRT, Chandra and XMM-Newton observations of IGR J17091-3624 as it returns into quiescence
• An Observational Signature of Sub-Equipartition Magnetic Fields in the Spectra of Black Hole Binaries
• Searching for Isolated Black Hole Candidates within 15 pc of the Solar System in Gaia DR3