Volume 533, September 2011
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||11 August 2011|
Discovery and identification of infrared counterpart candidates of four Galactic centre low mass X-ray binaries⋆
Laboratoire AIM, CEA/IRFU-Université Paris Diderot-CNRS/INSU, CEA DSM/IRFU/SAp, Centre de Saclay, 91191 Gif-sur-Yvette, France
2 François Arago Centre, APC, Université Paris Diderot, CNRS/IN2P3, CEA/DSM, Observatoire de Paris, 13 rue Watt, 75205 Paris Cedex 13, France
Received: 6 May 2011
Accepted: 1 July 2011
Context. The near infrared (nIR)/optical counterparts of low mass X-ray binaries (LMXBs) are often observationally dim and reside in high source density fields which make their identification problematic; however, without such a counterpart identification we are unable to investigate many of the properties of LMXB systems.
Aims. Here, in the context of a larger identification campaign, we examine the fields of four LMXB systems near the Galactic centre, in a bid to identify nIR/optical counterparts to the previously detected X-ray point sources.
Methods. We obtain nIR/optical images of the fields with the ESO – New Technology Telescope and apply standard photometric and astrometric calibrations; these data are supplemented by Spitzer-GLIMPSE catalog data.
Results. On the basis of positional coincidence with the arcsecond accurate X-ray positions, we identify unambiguous counterpart candidates for XTE J1637−498, IGR J17379−3747, IGR J17585−3057 and GX 9+1.
Conclusions. We propose tentative nIR counterparts of four LMXBs which require further investigation to confirm their associations to the X-ray sources.
Key words: X-rays: binaries / infrared: stars / X-rays: individuals: XTE J1637−498 / X-rays: individuals: IGR J17379 − 3747 / X-rays: individuals: IGR J17585−3057 / X-rays: individuals: GX 9+1
© ESO, 2011
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