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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The quiescent spectral energy distribution of V404 Cyg
Monthly Notices of the Royal Astronomical Society, Volume 399, No. 4, Year 2009
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Description
We present a multiwavelength study of the black hole X-ray binary V404 Cyg in quiescence, focusing upon the spectral energy distribution (SED). Radio, optical, ultraviolet (UV) and X-ray coverage is simultaneous. We supplement the SED with additional non-simultaneous data in the optical through infrared where necessary. The compiled SED is the most complete available for this, the X-ray and radio brightest quiescent black hole system. We find no need for a substantial contribution from accretion light from the near-UV to the near-IR, and in particular the weak UV emission constrains published spectral models for V404 Cyg. We confirm that no plausible companion spectrum and interstellar extinction can fully explain the mid-IR, however, and an infrared (IR) excess from a jet or cool disc appears to be required. The X-ray spectrum is consistent with a F ∼ 2 power law as found by all other studies to date. There is no evidence for any variation in the hardness over a range of a factor of 10 in luminosity. The radio flux is consistent with a flat spectrum (in f ν). The break frequency between a flat and optically thin spectrum most likely occurs in the mid or far-IR, but is not strongly constrained by these data. We find the radio to be substantially variable but with no clear correlation with X-ray variability. © 2009 RAS.
Authors & Co-Authors
Hynes, Robert I.
United States, Baton Rouge
Louisiana State University
Rupen, Michael P.
United States, Socorro
National Radio Astronomy Observatory Socorro
Gallo, Elena
United States, Santa Barbara
University of California, Santa Barbara
Fender, Robert P.
United Kingdom, Southampton
University of Southampton
Casares, J.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Zurita, Christina
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Statistics
Citations: 63
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1111/j.1365-2966.2009.15419.x
ISSN:
00358711
Research Areas
Environmental
Health System And Policy