Multiwavength Observations of the Black Hole X-Ray Binary A0620-00 in Quiescence
MetadataShow full item record
Copyright © 2017 The American Astronomical Society. All rights reserved.
We present results from simultaneous multiwavelength X-ray, radio, and optical/near-infrared observations of the quiescent black hole X-ray binary A0620-00 performed in 2013 December. We find that the Chandra flux has brightened by a factor of 2 since 2005, and by a factor of 7 since 2000. The spectrum has not changed significantly over this time, being consistent with a power law G = 2.07 ± 0.13 of and a hydrogen column of N H (3.0 ± 0.5) × 10 21 cm -2 . Very Large Array observations of A0620-00 at three frequencies, over the interval of 5.25-22.0 GHz, have provided us with the first broadband radio spectrum of a quiescent stellar mass black hole system at X-ray luminosities as low as 10 -8 times the Eddington luminosity. Compared to previous observations, the source has moved to lower radio and higher X-ray luminosity, shifting it perpendicular to the standard track of the radio/X-ray correlation for X-ray binaries. The radio spectrum is inverted with a spectral index a = 0.74 ± 0.19 (S v ? v a ). This suggests that the peak of the spectral energy distribution is likely to be between 10 12 and 10 14 Hz, and that the near-IR and optical flux contain significant contributions from the star, the accretion flow, and from the outflow. Decomposing these components may be difficult, but holds the promise of revealing the interplay between accretion and jet in low luminosity systems.
Showing items related by title, author, creator and subject.
Gusinskaia, N.V.; Russell, T.D.; Hessels, J.W.T.; Bogdanov, S.; Degenaar, N.; Deller, A.T.; Van Den Eijnden, J.; Jaodand, A.D.; Miller-Jones, James ; Wijnands, R. (2020)© 2019 The Author(s). IGR J17591-2342 is a new accreting millisecond X-ray pulsar that was recently discovered in outburst in 2018. Early observations revealed that the source's radio emission is brighter than that of any ...
Jonker, P.; Miller-Jones, James; Homan, J.; Tomsick, J.; Fender, R.; Kaaret, P.; Markoff, S.; Gallo, E. (2012)In this paper we report on Expanded Very Large Array radio and Chandra and Swift X-ray observations of the outburst decay of the transient black hole candidate MAXI J1659-152 in 2011. We discuss the distance to the source ...
Gusinskaia, N.V.; Hessels, J.W.T.; Degenaar, N.; Deller, A.T.; Miller-Jones, James ; Archibald, A.M.; Heinke, C.O.; Moldón, J.; Patruno, A.; Tomsick, J.A.; Wijnands, R. (2020)© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society Aql X-1 is one of the best-studied neutron star low-mass X-ray binaries. It was previously targeted using quasi-simultaneous ...