Chandra Localizations and Spectra of INTEGRAL Sources in the Galactic Plane

Abstract

We report on the results of observations of hard X-ray sources in the Galactic plane with the Chandra X-ray Observatory. The hard X-ray IGR sources were discovered by the INTEGRAL satellite, and the goals of the Chandra observations are to provide sub-arcsecond localizations to obtain optical and infrared counterparts and to provide constraints on their 0.3-10 keV spectra. We obtained relatively short, ~5 ks, observations for 20 IGR sources and find a bright Chandra source in INTEGRAL error circles in 12 cases. In 11 of these cases, a cross-correlation with optical and/or infrared source catalogs yields a counterpart, and the range of J-band magnitudes is 8.1-16.4. Also, in 4 cases, the Chandra X-ray spectra show evidence for absorbing material surrounding the compact object with a column density of local material in excess of 5x10^22 cm^-2. We confirm that IGR J00234+6141 is a Cataclysmic Variable and IGR J14515-5542 is an Active Galactic Nucleus (AGN). We also confirm that IGR J06074+2205, IGR J10101-5645, IGR J11305-6256, and IGR J17200-3116 are High Mass X-ray Binaries (HMXBs). Our results (along with follow-up optical spectroscopy reported elsewhere) indicate that IGR J11435-6109 is an HMXB and IGR J18259-0706 is an AGN. We find that IGR J09026-4812, IGR J18214-1318, and IGR J18325-0756 may be HMXBs. In cases where we do not find a Chandra counterpart, the flux upper limits place interesting constraints on the luminosities of black hole and neutron star X-ray transients in quiescence.

Accepted by ApJ

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Cited by in corpus (21)

• BASS XXII: The BASS DR2 AGN Catalog and Data
• INTEGRAL/IBIS nine-year Galactic Hard X-Ray Survey
• Cooling of Accretion-Heated Neutron Stars
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources
• 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
• INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
• Swift follow-up observations of 17 INTEGRAL sources of uncertain or unknown nature
• 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
• IGR J17445-2747 - yet another X-ray burster in the Galactic bulge
• NuSTAR observations of the unidentified INTEGRAL sources: constraints on the Galactic population of HMXBs
• Near-infrared spectroscopy of 20 new Chandra sources in the Norma Arm
• Sample of optically unidentified X-ray binaries in the Galactic bulge. Constraints on the physical nature from infrared photometric surveys
• Identifying four $INTEGRAL$ sources in the Galactic Plane via VLT/optical and $XMM$-$Newton$/X-ray spectroscopy
• The X-ray emission of the high mass X-ray binary IGR J17200-3116
• X-ray flashes from the low-mass X-ray binary IGR J17407-2808
• Swift unveils the orbital period of IGR J18214-1318
• Searching for supergiant fast X-ray transients with Swift
• Multi-wavelength observations of the Galactic X-ray binaries IGR J20155+3827 and Swift J1713.4-4219
• Classification of 3 accreting binaries with VLT/X-Shooter spectra