Journal Article

Quiescent X-ray/optical counterparts of the black hole transient H 1705−250

Y. J. Yang, A. K. H. Kong, D. M. Russell, F. Lewis and R. Wijnands

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 4, pages 2876-2880
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI:
Quiescent X-ray/optical counterparts of the black hole transient H 1705−250

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We report the result of a new Chandra observation of the black hole X-ray transient H 1705−250 in quiescence. H 1705−250 was barely detected in the new ∼50 ks Chandra observation. With five detected counts, we estimate the source quiescent luminosity to be LX ∼ 9.1 × 1030 erg s−1 in the 0.5–10 keV band (adopting a distance of 8.6 kpc). This value is in line with the quiescent luminosities found among other black hole X-ray binaries with similar orbital periods. By using images taken with the Faulkes Telescope North, we derive a refined position of H 1705−250. We also present the long-term light curve of the optical counterpart from 2006 to 2012, and show evidence for variability in quiescence.

Keywords: X-rays: binaries

Journal Article.  3749 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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