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Advection‐dominated Accretion Model of the Black Hole V404 Cygni in Quiescence

Advection‐dominated Accretion Model of the Black Hole V404 Cygni in Quiescence

We have analyzed archival ASCA data on the soft X-ray transient source V404 Cyg in quiescence. We find that in the energy range 0.7-8.5 keV the spectrum is a hard power law with a photon spectral index between 1.8 and 2.6 (90% confidence limits). We present a model of V404 …