Arcsec Rms Research Articles

Radio positions and optical identifications for radio sources selected at 966 MHz - II

In a previous paper, accurate radio position measurements and optical identifications were published for 538 sources selected from a survey made at 966 MHz. The remaining 242 sources in the sample were either heavily resolved or confused in these observations and no accurate radio positions could be obtained. Here we present radio position measurements of these remaining sources, made at 2.7 and 5.0 GHz using the 300-ft telescope at NRAO. The positions obtained have rms errors of about 6 arcsec in right ascension and 11 arcsec in declination. A few of the sources have also been observed at 2.7 GHz with the NRAO three-element interferometer, giving positions accurate to 1 arcsec rms. These new positions have been used in a search for optical identifications on the Palomar Sky Survey. Optical positions (with rms errors of 0.5 arcsec) have been measured for candidate identifications. One hundred and thirty-five identifications are proposed, and the reliability of these is estimated at about 80 per cent.