GMRT observations of the field of INTEGRAL X-ray sources- II (newly discovered hard X-ray sources)

Abstract

We have conducted low-frequency radio observations with the Giant Metrewave Radio Telescope (GMRT) of 40 new hard X-ray sources discovered by the INTEGRAL satellite. This survey was conducted in order, to study radio emissions from these sources, to provide precise position and to identify new microquasar candidates. From our observations we find that 24 of the X-ray sources have radio candidates within the INTEGRAL error circle. Based on the radio morphology, variability and information available from different wavelengths, we categorize them as seventeen Galactic sources (4 unresolved, 7 extended, 6 extended sources in diffuse region) and seven extragalactic sources (2 unresolved, 5 extended). Detailed account for seventeen of these sources was presented in earlier paper. Based on the radio data for the remaining sources at 0.61 GHz, and the available information from NVSS, DSS, 2MASS and NED, we have identified possible radio counterparts for the hard X-ray sources. The three unresolved sources, viz IGR J17303$-$0601, IGR J17464$-$3213, and IGR J18406$-$0539 are discussed in detail. These sources have been identified as X-ray binaries with compact central engine and variable in X-ray and in the radio, and are most likely microquasar candidates. The remaining fourteen sources have extended radio morphology and are either diffuse Galactic regions or extragalactic in origin.

9 pages, 7 figures, submitted to A&A. submitted to A&A

References in corpus (11)

• High- and low-frequency quasi-periodic oscillations in the X-ray light curves of the black hole transient H1743-322
• Hard X-ray view of the past activity of Sgr A* in a natural Compton mirror
• Discovery of X-ray Jets in the Microquasar H 1743-322
• Unveiling the nature of three INTEGRAL sources through optical spectroscopy
• Identification of the optical counterparts of high-mass X-ray binaries through optical photometry and spectroscopy
• INTEGRAL observations of five sources in the Galactic Center region
• Using the ROSAT Bright Source Catalogue to find Counterparts for IBIS/ISGRI Survey Sources
• 3-200 keV spectral states and variability of the INTEGRAL Black Hole binary IGR J17464-3213
• The soft X-ray counterpart of the newly discovered INTEGRAL source IGRJ16195-4945
• GMRT observations of the field of INTEGRAL X-ray sources- I
• Detection and analysis of a new INTEGRAL hard X-ray transient, IGR J17285-2922

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• The Massive Star-Forming Regions Omnibus X-Ray Catalog, Second Installment
• The two INTEGRAL X-ray transients IGR J17091--3624 and IGR J17098--3628: a multi-wavelength long term campaign
• Radio and IR study of the massive star-forming region IRAS 16353-4636