Accurate Localization and Identification of Six Hard X-ray Sources from Chandra and XMM-Newton data

Abstract

We present the results of Chandra and XMM-Newton observations for six hard X-ray sources (IGR J12134-6015, IGR J18293-1213, IGR J18219-1347, IGR J17350-2045, IGR J18048-1455, XTE J1901+014) from the INTEGRAL all-sky survey. Based on these observations, we have improved significantly the localization accuracy of the objects and, therefore, have managed to identify their optical counterparts. Using data from the publicly available 2MASS and UKIDSS infrared sky surveys as well as data from the SOFI/NTT telescope (European Southern Observatory), we have determined the magnitudes of the optical counterparts, estimated their types and (in some cases) the distances to the program objects. A triplet of iron lines with energies of 6.4, 6.7, and 6.9 keV has been detected in the X-ray spectrum of IGR J18048-1455; together with the detection of pulsations with a period of ~1440 s from this source, this has allowed it to be classified as a cataclysmic variable, most likely an intermediate polar. In addition, broadband X-ray spectra of IGR J12134-6015 and IGR J17350-2045 in combination with infrared and radio observations suggest an extragalactic nature of these objects. The source IGR J18219-1347 presumably belongs to the class of high-mass X-ray binaries.

15 pages, 9 figures. Will be published in Astronomy Letters, 2012, Vol. 38, No. 10, pp. 629-637

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• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
• New hard X-ray sources discovered in the ongoing INTEGRAL Galactic Plane survey after 14 years of observations
• INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
• Chandra Observations of Eight Sources Discovered by INTEGRAL
• X-ray pulsar XTE J1858+034: discovery of the cyclotron line and the revised optical identification
• IGR J18293-1213 is an eclipsing Cataclysmic Variable
• Identification of Four X-ray Sources from the INTEGRAL and Swift Catalogs
• Chandra Identification of Two AGN Discovered by INTEGRAL
• Identification of an X-ray Pulsar in the BeXRB system IGR J18219$-$1347
• Investigating the true nature of three hard X-ray sources