The Quiescent Spectral Energy Distribution of V404 Cyg

Details The Quiescent Spectral Energy Distribution of V404 Cyg The Quiescent Spectral Energy Distribution of V404 Cyg

2009-07-24

arxiv.org/abs/0907.4376v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted for publication by Monthly Notices of the Royal Astronomical Society

Scientific paper

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, 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 IR excess from a jet or cool disc appears to be required. The X-ray spectrum is consistent with a Gamma~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(nu)). 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.

Affiliated with

Also associated with

No associations

Rating

The Quiescent Spectral Energy Distribution of V404 Cyg does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Quiescent Spectral Energy Distribution of V404 Cyg, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Quiescent Spectral Energy Distribution of V404 Cyg will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-639297