Identifications of Five INTEGRAL Sources via Optical Spectroscopy

Details Identifications of Five INTEGRAL Sources via Optical Spectroscopy Identifications of Five INTEGRAL Sources via Optical Spectroscopy

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21443105b&link_type=abstract

American Astronomical Society, AAS Meeting #214, #431.05; Bulletin of the American Astronomical Society, Vol. 41, p.702

Astronomy and Astrophysics

Astrophysics

Scientific paper

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 L0.3-10 keV = 5 x 1036 erg s-1 for IGR J18214-1318, L0.3-10 keV =1.3 x1032 erg s-1 for IGR J18308-1232, and L0.3-10 keV = 6.7 x 1032 erg s-1 for IGR J19267+1325.
SCB acknowledges partial support from Chandra awards GO7-8050X and GO8-9055X issued by the Chandra X-ray Observatory Center. Also, SCB is partially supported by a UC Berkeley Chancellor's Fellowship and an SSL Summer Science Fellowship.

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