Bradley, Charles K.; Hynes, Robert I.; Kong, Albert K. H.; Haswell, C. A.; Casares, J. and Gallo, E.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1086/520323|
|Google Scholar:||Look up in Google Scholar|
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.
|Item Type:||Journal Article|
|Keywords:||Subject headings: binaries: close — black hole physics — stars: individual (V404 Cyg) — X-rays: stars|
|Academic Unit/Department:||Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Astrid Peterkin|
|Date Deposited:||29 May 2008|
|Last Modified:||14 Jan 2016 16:56|
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