Jet-dominated quiescent states in black hole X-ray binaries: the case of V404 Cyg

Abstract

The dynamical and radiative properties of the quiescent state (X-ray luminosity $<10^{34}\mathrm{erg}{\mathrm{s}}^{-1}\mathrm{c}{\mathrm{m}}^{-2}$) of black hole X-ray transients (BHXTs) remains unclear, mainly because of low-luminosity and poor data quantity. We demonstrate that, the simultaneous multi-wavelength (including radio, optical, ultraviolet and X-ray bands) spectrum of V404 Cyg in its bright quiescent state can be well described by the radiation from the companion star and more importantly, the compact jet. Neither the outer thin disc nor the inner hot accretion flow is important in the total spectrum. Together with several additional recent findings, i.e. the power-law X-ray spectrum and the constant X-ray spectral shape (or constant photon index) in contrast to the dramatic change in the X-ray luminosity, we argue the quiescent state spectrum of BHXTs is actually jet-dominated. Observational features consistent with this jet model are also discussed as supporting evidences.

accepted for the publication in MNRAS Letters, 5 pages, 2 figures

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Cited by in corpus (8)

• Correlation between the photon index and X-ray luminosity of black hole X-ray binaries and active galactic nuclei: observations and interpretation
• The 2015 Decay of the Black Hole X-ray Binary V404 Cygni: Robust Disk-Jet Coupling and a Sharp Transition into Quiescence
• Fundamental Plane of Black Hole Activity in Quiescent Regime
• A disc corona-jet model for the radio/X-ray correlation in black hole X-ray binaries
• Coronal properties of black hole X-ray binaries in the hard state as seen by NuSTAR and Swift
• A luminous hot accretion flow in the low-luminosity active galactic nucleus NGC 7213
• Polarized synchrotron emission in quiescent black hole X-ray transients
• Scale invariant jets: from blazars to microquasars