Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-07-19
Astrophys.J. 611 (2004) L125-L128
Astronomy and Astrophysics
Astrophysics
5 pages; Accepted for publication in the Astrophysical Journal Letters
Scientific paper
10.1086/424005
We report simultaneous X-ray and optical observations of V404 Cyg in quiescence. The X-ray flux varied dramatically by a factor of >20 during a 60ks observation. X-ray variations were well correlated with those in Halpha, although the latter include an approximately constant component as well. Correlations can also be seen with the optical continuum, although these are less clear. We see no large lag between X-ray and optical line variations; this implies they are causally connected on short timescales. As in previous observations, Halpha flares exhibit a double-peaked profile suggesting emission distributed across the accretion disk. The peak separation is consistent with material extending outwards to at least the circularization radius. The prompt response in the entire Halpha line confirms that the variability is powered by X-ray (and/or EUV) irradiation.
Casares Jorge
Charles Phil A.
Eves B. A. C.
Fender Rob P.
Gallo Elena
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