The infrared counterpart of the Z source GX5-1

Abstract

We have obtained UKIRT infrared observations of the field of the bright Galactic Z source GX5-1. From an astrometric plate solution tied to Tycho-ACT standards we have obtained accurate positions for the stars in our field which, combined with an accurate radio position, have allowed us to identify the probable infrared counterpart of GX5-1. Narrow-band photometry marginally suggests excess Br-gamma emission in the counterpart, supporting its association with an accretion-disc source. No significant variability is observed in a limited number of observations. We compare the H and K magnitudes with those of other Z sources, and briefly discuss possible sources of infrared emission in these systems.

5 pages, 2 figures, accepted by MNRAS

References in corpus (1)

• Infrared Candidates for the Intense Galactic X-ray Source GX 17+2

Cited by in corpus (13)

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• On the nature of the break in the X-ray luminosity function of low-mass X-ray binaries
• The X-ray Halo of GX5-1
• Simultaneous radio and X-ray observations of Galactic Centre low mass X-ray binaries
• Resolving the Hard X-ray Emission of GX 5-1 with INTEGRAL
• Sample of LMXBs in the Galactic bulge. I. Optical and near-infrared constraints from the Virtual Observatory
• Spectroscopic Identification of the Infrared Counterpart to GX5-1
• X-ray polarization of Z-type neutron star low-mass X-ray binaries -- I. Model-independent, time-resolved X-ray polarimetry
• On the origin of the near-infrared emission from the neutron-star low-mass X-ray binary GX 9+1