Discovery of the near-infrared counterpart to the luminous neutron-star low-mass X-ray binary GX 3+1

Abstract

Using the High Resolution Camera onboard the Chandra X-ray Observatory, we have measured an accurate position for the bright persistent neutron-star X-ray binary and atoll source GX 3+1. At a location that is consistent with this new position we have discovered the near-infrared (NIR) counterpart to GX 3+1 in images taken with the PANIC and FourStar cameras on the Magellan Baade Telescope. The identification of this K_s=15.8+-0.1 mag star as the counterpart is based on the presence of a Br-gamma emission line in a NIR spectrum taken with the FIRE spectrograph on the Baade Telescope. The absolute magnitude derived from the best available distance estimate to GX 3+1 indicates that the mass donor in the system is not a late-type giant. We find that the NIR light in GX 3+1 is likely dominated by the contribution from a heated outer accretion disk. This is similar to what has been found for the NIR flux from the brighter class of Z sources, but unlike the behavior of atolls fainter (Lx ~ 1e36 to 1e37 erg/s) than GX 3+1, where optically-thin synchrotron emission from a jet probably dominates the NIR flux.

arXiv commentAccepted for publication in ApJ

References in corpus (25)

• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
• The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images
• A Scheme to Unify Low-Power Accreting Black Holes - Jet-Dominated Accretion Flows and the Radio/X-Ray Correlation
• First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
• Photospheric radius expansion X-ray bursts as standard candles
• Low mass X-ray binaries as a stellar mass indicator for the host galaxy
• Low-extinction windows in the inner Galactic Bulge
• Interstellar Extinction Law toward the Galactic Center II: V, J, H, and Ks Bands
• XTE J1701-462 and its Implications for the Nature of Subclasses in Low-Magnetic-Field Neutron Star Low-Mass X-Ray Binaries
• Infrared spectroscopy of low-mass X-ray binaries II
• The complete spectrum of the neutron star X-ray binary 4U0614+091
• Evidence for a jet contribution to the optical/infrared light of neutron star X-ray binaries
• PANIC: A Near-infrared Camera for the Magellan Telescopes
• Simultaneous BeppoSAX and RXTE observations of the X-ray burst sources GX 3+1 and Ser X-1
• On the nature of the break in the X-ray luminosity function of low-mass X-ray binaries
• Burst-properties as a function of mass accretion rate in GX 3+1
• Simultaneous radio and X-ray observations of Galactic Centre low mass X-ray binaries
• Very long-term X-ray variations in LMXBs: solar cycle-like variations in the donor?
• A variable near-infrared counterpart to the neutron-star low-mass X-ray binary 4U 1705-440
• Period--luminosity relation for persistent LMXBs in the near-infrared
• Decade time-scale modulation of low mass X-ray binaries
• Sample of LMXBs in the Galactic bulge. I. Optical and near-infrared constraints from the Virtual Observatory
• Discovery and identification of infrared counterpart candidates of four Galactic centre low mass X-ray binaries
• Spectroscopic Identification of the Infrared Counterpart to GX5-1

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• A catalogue of unusually long thermonuclear bursts on neutron stars
• Study of the reflection spectrum of the bright atoll source GX 3+1 with NuSTAR
• Machine Learning Classification of COSMOS2020 Galaxies: Quiescent vs. Star-Forming
• AstroSat observation of rapid Type-I thermonuclear burst from the low mass X-ray binary GX 3+1
• On the origin of the near-infrared emission from the neutron-star low-mass X-ray binary GX 9+1
• A Chronological History of X-Ray Astronomy Missions
• COSMOS2025: A Machine Learning Census of Massive Quiescent Galaxies at $2.5<\text{z}<5$