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The Spectrum of the Black Hole X‐Ray Nova V404 Cygni in Quiescence as Measured by<i>XMM‐Newton</i>
We present XMM observations of the black hole X-ray nova V404 Cygni in quiescence. Its quiescent spectrum can be best fitted by a simple power-law with slope 2. The spectra are consistent with that expected for the advection-dominated accretion flow (ADAF). V404 Cyg was roughly equal in luminosity compared to …