Radio Source Measurements at 960 MC/S

Abstract

The major surveys of radio sources made at meter wavelengths have shown a disquieting lack of agreement, and an independent study of these sources using as simple an antenna as possible seems to be desirable. As a partial step in this direction, we report here a study of 106 radio sources made with one of the equatorially-mounted 90-foot paraboloids of the Owens Valley Radio Observatory. This investigation was made at a frequency of 960 Mc/s. The primary result of the study is a reliable catalog of sources which will be used as a 'finding list' for precise position measurements which are currently being undertaken with the two antennas operating as an interferometer. In addition, however, the results provide valuable information on the spectra of the sources, and have also been used in a search for optical counterparts to the sources. Ninety of the objects observed were taken from the Third Cambridge Survey (3C), which was kindly made available to us by the authors prior to publication. The remaining 16 objects in the present list were either taken from other catalogs or were discovered in the course of the present investigation. The equipment is briefly described in Section II, and in Sections III and IV the methods of determining the position and intensity of the sources are outlined. In Section V suggested optical identifications are discussed, while Section VI is devoted to a consideration of the spectra of the sources. The positions, intensities, spectral indices, and other pertinent data for the 106 sources are collected in Table I.

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