Journal Article

Limits on the quiescent radio emission from the black hole binaries GRO J1655−40 and XTE J1550−564

D. E. Calvelo, R. P. Fender, D. M. Russell, E. Gallo, S. Corbel, A. K. Tzioumis, M. E. Bell, F. Lewis and T. J. Maccarone

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 409, issue 2, pages 839-845
Published in print December 2010 | ISSN: 0035-8711
Published online November 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17348.x
Limits on the quiescent radio emission from the black hole binaries GRO J1655−40 and XTE J1550−564

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We present the results of radio observations of the black hole binaries GRO J1655−40 and XTE J1550−564 in quiescence, with the upgraded Australia Telescope Compact Array. Neither system was detected. Radio flux density upper limits (3σ) of 26 μJy (at 5.5 GHz), 47 μJy (at 9 GHz) for GRO J1655−40 and 1.4 mJy (at 1.75 GHz), 27 μJy (at 5.5 GHz), 47 μJy (at 9 GHz) for XTE J1550−564 were measured. In conjunction with quasi-simultaneous Chandra X-ray observations (in the case of GRO J1655−40) and Faulkes Telescope optical observations (XTE J1550−564) we find that these systems provide the first evidence of relatively ‘radio-quiet’ black hole binaries at low luminosities, indicating that the scatter observed in the hard state X-ray–radio correlation at higher luminosities may also extend towards quiescent levels.

Keywords: black hole physics; binaries: close; stars: individual: XTE J1550−564; stars: individual: GRO J1655−40; ISM: jets and outflows; X-rays: binaries

Journal Article.  4427 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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