Jet-dominated quiescent states in black hole X-ray binaries: the case of V404 Cyg
arXiv:1403.2626 · doi:10.1093/mnrasl/slu068
Abstract
The dynamical and radiative properties of the quiescent state (X-ray luminosity ) 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.
arXiv commentaccepted for the publication in MNRAS Letters, 5 pages, 2 figures
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