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The black hole candidate XTE J1752-223 towards and in quiescence: optical and simultaneous X-ray - radio observations | | E.M. Ratti
; P.G. Jonker
; J.C.A. Miller-Jones
; M.A.P. Torres
; J. Homan
; S. Markoff
; J.A. Tomsick
; P. Kaaret
; R. Wijnands
; E. Gallo
; F.Ozel
; D.T.H. Steeghs
; R.P. Fender
; | | Date: |
12 Apr 2012 | | Abstract: | 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 magnitudes 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 magnitudes 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 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" 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. | | Source: | arXiv, 1204.2735 | | Services: | Forum | Review | PDF | Favorites | |
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