Identifications of five INTEGRAL sources via optical spectroscopy
Butler, Suzanne C. and Tomsick, John A. and Chaty, Sylvain and Heras, Juan A. Zurita and Rodriguez, Jerome and Walter, Roland and Kaaret, Philip and Kalemci, Emrah and Özbey, Mehtap (2009) Identifications of five INTEGRAL sources via optical spectroscopy. The Astrophysical Journal, 698 (1). pp. 502-508. ISSN 0004-637X
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Official URL: http://dx.doi.org/10.1088/0004-637X/698/1/502
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 (similar to 0.5-10 keV) and higher angular resolutions than INTEGRAL have allowed for unique optical counterparts to be located. We find that INTEGRAL Gamma-Ray (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 L0.3-10 (keV) = 5 x 10(36) erg s(-1) for IGR J18214-1318, L0.3-10 keV = 1.3 x 10(32) erg s(-1) for IGR J18308-1232, and L0.3-10 keV = 6.7 x 10(32) erg s(-1) for IGR J19267+1325.
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