Publication Date:
2013-05-26
Description:
We report results of the first phase of observations with the Australia Telescope Compact Array (ATCA) at 5 and 9 GHz of the fields around 411 -ray sources with declinations 〈+10° detected by Fermi but marked as unassociated in the Fermi Large Area Telescope 2-Year Source Catalog (2FGL). We have detected 424 sources with flux densities in the range 2–6 Jy that lie within the 99 per cent localization uncertainty of 283 -ray sources. Of these, 146 objects were detected in both 5- and 9-GHz bands. We found 84 sources in our sample with a spectral index flatter than –0.5. The majority of detected sources are weaker than 100 mJy and for this reason were not found in previous surveys. Approximately one third of our sample, 128 objects, have a probability of being associated more than 10 times greater than the probability of being a background source found in the vicinity of a -ray object by chance. We present the catalogue of positions of these sources, estimates of their flux densities and spectral indices where available.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics