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Issue A&A
Volume 446, Number 2, February I 2006
Page(s) 471 - 483
Section Galactic structure, stellar clusters and populations
DOI 10.1051/0004-6361:20042317

A&A 446, 471-483 (2006)
DOI: 10.1051/0004-6361:20042317

GMRT observations of the field of INTEGRAL X-ray sources - I

M. Pandey1, R. K. Manchanda2, A. P. Rao3, P. Durouchoux4 and Ishwara-Chandra3

1  Department of Physics, Mumbai University, 400 098 Mumbai, India
    e-mail: mamta@ncra.tifr.res.in
2  Department of Astronomy and Astrophysics, TIFR, Colaba, 400005 Mumbai, India
3  NCRA, TIFR, Post Bag 3, Ganeshkhind, 411 007 Pune, India
4  CNRS FRE 2591/CEA Saclay, DSM/DAPNIA/SAP, 91191 Gif-sur-Yvette Cedex, France

(Received 5 November 2004 / Accepted 8 September 2005)

Abstract
Since its launch the INTEGRAL observatory has discovered a variety of hard X-ray sources in the Galactic plane. Using GMRT, we have made repeated observations of these sources to search for the radio counterparts of seventeen of them at low frequencies. The source positions were taken from the various ATEL and IAUC announcements reporting their discovery. Possible radio counterparts for seven of these sources, IGR J06074+2205, IGR J15479-4529, IGR J16479-4514, IGR J17091-3624, IGR J18027-1455, IGR J18539+0727 and IGR J21247+5058 were detected within 3$\sigma$ of the positional uncertainty derived from the INTEGRAL observations. The offset in the radio position was calculated using the positions mentioned in the ATEL. We have also analyzed the available NVSS images for some of these fields at 1.4 GHz along with our observations. In this paper we present the radio images and the best fit positions for the positive detections. The X-ray variability for some of the sources within the time scales of 100 s to 1 ks as seen in the RXTE/PCA light curves suggests their Galactic origin and possible binary nature. We discuss briefly the characteristics of these sources from the available information at different wave bands.


Key words: X-ray: binaries -- binaries: close -- radiation mechanism: nonthermal -- instrumentation: high angular resolution -- instrumentation: interferometers

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