Spectroscopic identification of INTEGRAL high-energy sources with VLT/ISAAC

Abstract

The INTEGRAL satellite has been observing the gamma-ray sky for 15 years and has detected over 900 X-ray sources of various nature. However, more than 200 of these sources still lack precise identification. Our goal is to reveal the nature of the high-energy sources detected by INTEGRAL. In particular, we want to improve the census of X-ray binaries. Photometry and spectroscopy were performed in July 2012 on 14 INTEGRAL sources in near-infrared at the Very Large Telescope on the European Southern Observatory-UT3 telescope equipped with the ISAAC spectrograph. We used K${}_s$ images reaching to a depth of magnitude 18.5 to look for unique counterparts to high-energy detections to check for both extended sources and photometric variability. The analysis of near-infrared spectral features allows us to constrain the nature of these X-ray sources by comparing them to stellar spectra atlases. We present photometric and/or spectroscopic data for 14 sources (IGR J00465$-$4005, IGR J10447$-$6027, IGR J12489$-$6243, IGR J13020$-$6359, IGR J13186$-$6257, IGR J15293$-$5609, IGR J17200$-$3116, IGR J17404$-$3655, IGR J17586$-$2129, IGR J17597$-$2201, IGR J18457+0244, IGR J18532+0416, IGR J19308$+$0530, and IGR J19378$-$0617). We conclude that 5 of these are active galactic nuclei, 5 are cataclysmic variables, 2 are low- or intermediate-mass X-ray binaries, and 2 are Be high-mass X-ray binaries.

arXiv comment15 pages

References in corpus (38)

• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The USNO-B Catalog
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• The Relation Between Optical Extinction and Hydrogen Column Density in the Galaxy
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• Catalogue of high-mass X-ray binaries in the Galaxy ($4^{th}$ edition)
• A catalogue of low-mass X-ray binaries in the Galaxy, LMC, and SMC (Fourth edition)
• The XMM-Newton serendipitous survey. VII. The third XMM-Newton serendipitous source catalogue
• The 3rd IBIS/ISGRI soft gamma-ray survey catalog
• The 4th IBIS/ISGRI soft gamma-ray survey catalog
• A Medium Resolution Near-Infrared Spectral Atlas of O and Early B Stars
• Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. I. The nature of the companion star
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. V. Identification and properties of 21 southern hard X-ray sources
• The IBIS soft gamma-ray sky after 1000 INTEGRAL orbits
• Optical and X-ray observations of the neutron star soft X-ray transient XTE J1709-267
• A description of sources detected by INTEGRAL during the first 4 years of observations
• A Medium-Resolution Near-Infrared Spectral Library of Late Type Stars: I
• INTEGRAL/IBIS survey of the Sagittarius Arm Tangent region: A source catalog
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. VIII. Identification of 44 newly detected hard X-ray sources
• Chandra Localizations and Spectra of INTEGRAL Sources in the Galactic Plane: The Cycle 9 Sample
• Hard X-ray emission from Eta Carinae
• Chandra Localizations and Spectra of INTEGRAL Sources in the Galactic Plane
• Infrared identification of high-mass X-ray binaries discovered by INTEGRAL
• The Detection of 13CO and Other Apparent Abundance Anomalies in the Secondary Stars of Long-Period Cataclysmic Variables
• Two SMC Symbiotic stars undergoing steady hydrogen burning
• X-ray Luminosities of Optically-Selected Cataclysmic Variables and Application to the Galactic Ridge X-ray Emission
• Swift/XRT observations of unidentified INTEGRAL/IBIS sources
• An atlas of 2.4 to 4.1 microns ISO/SWS spectra of early-type stars
• Swift Follow-up Observations of INTEGRAL Sources of Unknown Nature
• Chandra localisation and optical/NIR follow-up of Galactic X-ray sources
• Discovery and study of the accreting pulsar 2RXP J130159.6-635806
• Localizing INTEGRAL Sources with Chandra: X-Ray and Multi-Wavelength Identifications and Energy Spectra
• Swift follow-up observations of 17 INTEGRAL sources of uncertain or unknown nature
• Five new INTEGRAL unidentified hard X-Ray sources uncovered by Chandra
• XMM-Newton observations of five INTEGRAL sources located towards the Scutum Arm
• IGR J19308+0530: Roche lobe overflow on to a compact object from a donor 1.8 times as massive
• The X-ray emission of the high mass X-ray binary IGR J17200-3116

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• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• XRBcats: Galactic Low Mass X-ray Binary Catalogue
• Low-Mass X-ray Binaries
• INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
• INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
• Constraints to neutron-star kicks in High-Mass X-ray Binaries with Gaia EDR3
• 15 years of Galactic surveys and hard X-ray Background measurements
• Chandra Observations of High Energy X-ray Sources Discovered by INTEGRAL
• Cataclysmic Variables in Triples: Formation Models and New Discoveries
• NuSTAR observations of the unidentified INTEGRAL sources: constraints on the Galactic population of HMXBs
• Multi-wavelength observations of the Galactic X-ray binaries IGR J20155+3827 and Swift J1713.4-4219
• The dark side of supergiant High-Mass X-ray Binaries
• Classification of 3 accreting binaries with VLT/X-Shooter spectra