A 610-MHz survey of the ELAIS-N1 field with the Giant Metrewave Radio Telescope - observations, data analysis and source catalogue
Observations of the European Large-Area ISO Survey-North 1 (ELAIS-N1) field taken at 610 MHz with the Giant Metrewave Radio Telescope are presented. 19 pointings were observed, covering a total area of ̃ 9 deg2 with a resolution of 6 × 5 arcsec2, position angle (PA) +45°. Four of the pointings were deep observations with an rms of ̃40 μJy before primary beam correction, with the remaining 15 pointings having an rms of ̃70 μJy. The techniques used for data reduction and production of a mosaicked image of the region are described, and the final mosaic is presented, along with a catalogue of 2500 sources detected above 6σ. This work complements the large amount of optical and infrared data already available on the region. We calculate 610-MHz source counts down to 270 μJy, and find further evidence for the turnover in differential number counts below 1 mJy, previously seen at both 610 MHz and 1.4 GHz.
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- January 2008
- radio continuum: galaxies;
- 12 pages, 18 figures, two tables. Table 1 can be found in full via http://www.mrao.cam.ac.uk/surveys/ . Accepted for publication in MNRAS