Identifications of Five INTEGRAL Sources via Optical Spectroscopy

Abstract

The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) is discovering hundreds of new hard X-ray sources, many of which remain unidentified. We report on optical spectroscopy of five such sources for which X-ray observations at lower energies (~0.5-10 keV) and higher angular resolutions than INTEGRAL have allowed for unique optical counterparts to be located. We find that IGR J16426+6536 and IGR J22292+6647 are Type 1 Seyfert active galactic nuclei (with IGR J16426+6536 further classified as a Seyfert 1.5) which have redshifts of z=0.323 and z=0.113, respectively. IGR J18308-1232 is identified as a cataclysmic variable (CV), and we confirm a previous identification of IGR J19267+1325 as a magnetic CV. IGR J18214-1318 is identified as an obscured high mass X-ray binary (HMXB), which are systems thought to have a compact object embedded in the stellar wind of a massive star. We combine Chandra fluxes with distances based on the optical observations to calculate X-ray luminosities of the HMXB and CVs, finding L_(0.3-10 keV)=5e36 erg s^-1 for IGR J18214-1318, L_(0.3-10 keV)=1.3e32 erg s^-1 for IGR J18308-1232, and L_(0.3-10 keV)=6.7e32 erg s^-1 for IGR J19267+1325.

8 pages, 5 figures, accepted for publication by ApJ

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• The Second INTEGRAL AGN Catalogue
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• Reflection in Seyfert Galaxies and the Unified Model of AGN
• Population of persistent high mass X-ray binaries in the Milky Way
• INTEGRAL/IBIS 7-year All-Sky Hard X-Ray Survey. Part II: Catalog of Sources
• A catalogue of high-mass X-ray binaries in the Galaxy: from the INTEGRAL to the Gaia era
• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. VIII. Identification of 44 newly detected hard X-ray sources
• Clustering between high-mass X-ray binaries and OB associations in the Milky Way
• Chandra Localizations and Spectra of INTEGRAL Sources in the Galactic Plane: The Cycle 9 Sample
• Distribution of High-Mass X-ray Binaries in the Milky Way
• Narrow Line Seyfert 1 galaxies at hard X-rays
• INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
• Localizing INTEGRAL Sources with Chandra: X-Ray and Multi-Wavelength Identifications and Energy Spectra
• Supernova explosions of massive stars and cosmic rays
• The nature of fifty Palermo Swift-BAT hard X-ray objects through optical spectroscopy
• The Orbital Period vs. Absolute Magnitude Relationship of Intermediate Polars: Implications for Low States and Outbursts
• An XMM-Newton and NuSTAR study of IGR J18214-1318: a non-pulsating high-mass X-ray binary with a neutron star
• 15 years of Galactic surveys and hard X-ray Background measurements
• Swift unveils the orbital period of IGR J18214-1318
• SRG/ART-XC Galactic Plane Survey near Galactic Longitude $l\simeq 20^{\circ }$: Catalog of Sources
• Investigating the Optical Counterpart Candidates of Four INTEGRAL Sources localized with Chandra