Document Type
Article
Publication Date
1-1-2007
Abstract
We present XMM-Newton observations of the black hole X-ray nova V404 Cyg in quiescence. Its quiescent spectrum can be best fitted by a simple power law with slope Γ ∼ 2. The spectra are consistent with that expected for the advection-dominated accretion flow (ADAF). V404 Cyg was roughly equal in luminosity compared to the previous observation of Chandra. We see variability of a factor of 4 during the observation. We find no evidence for the presence of fluorescent or H-like/He-like iron emission, with upper limits of 52 and 110 eV, respectively. The limit on the fluorescent emission is improved by a factor of 15 over the previous estimate, and the restriction on H-like/He-like emission is lower than predicted from models by a factor of roughly 2. © 2007. The American Astronomical Society. All rights reserved.
Publication Source (Journal or Book title)
Astrophysical Journal
First Page
427
Last Page
432
Recommended Citation
Bradley, C., Hynes, R., Kong, A., Haswell, C., Casares, J., & Gallo, E. (2007). The spectrum of the black hole X-ray nova V404 cygni in quiescence as measured by XMM-Newton. Astrophysical Journal, 667 (1 I), 427-432. https://doi.org/10.1086/520323
