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2012MNRAS.423.2656R - Mon. Not. R. Astron. Soc., 423, 2656-2667 (2012/July-1)

The black hole candidate XTE J1752-223 towards and in quiescence: optical and simultaneous x-ray–radio observations.

RATTI E.M., JONKER P.G., MILLER-JONES J.C.A., TORRES M.A.P., HOMAN J., MARKOFF S., TOMSICK J.A., KAARET P., WIJNANDS R., GALLO E., OZEL F., STEEGHS D.T.H. and FENDER R.P.

Abstract (from CDS):

We present optical, X-ray and radio observations of the black hole transient (BHT) XTE J1752-223 towards and in quiescence. Optical photometry shows that the quiescent magnitude of XTE J1752-223 is fainter than 24.4 mag in the i' band. A comparison with measurements of the source during its 2009–2010 outburst shows that the outburst amplitude is more than 8 mag in the i' band. Known X-ray properties of the source combined with the faintness of the quiescence optical counterpart and the large outburst optical amplitude point towards a short orbital-period system (Porb ≲ 6.8 h) with an M type (or later) mass donor, at a distance of 3.5 ≲ d ≲ 8 kpc. Simultaneous X-ray and radio data were collected with Chandra and the Expanded Very Large Array (EVLA), allowing constraints to be placed on the quiescent X-ray and radio flux of XTE J1752-223. Furthermore, using data covering the final stage of the outburst decay, we investigated the low-luminosity end of the X-ray–radio correlation for this source and compared it with other BHTs. We found that XTE J1752-223 adds to the number of outliers with respect to the standard' X-ray–radio luminosity relation. Furthermore, XTE J1752-223 is the second source, after the BHT H1743-322, that shows a transition from the region of the outliers towards the standard' correlation at low luminosity. Finally, we report on a faint, variable X-ray source we discovered with Chandra at an angular distance of ∼2.9 arcsec to XTE J1752-223 and at a position angle consistent with that of the radio jets previously observed from the BHT. We discuss the possibility that we detected X-ray emission associated with a jet from XTE J1752-223.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): accretion, accretion discs - binaries: general - stars: individual: XTE J1752-223 - X-rays: binaries