The quasars from the Parkes 2700-MHz survey

Details The quasars from the Parkes 2700-MHz survey The quasars from the Parkes 2700-MHz survey

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975obs....95..196w&link_type=abstract

The Observatory, vol. 95, Oct. 1975, p. 196-204.

Astronomy and Astrophysics

Astronomy

16

Microwave Emission, Quasars, Radio Astronomy, Astronomical Catalogs, Optical Measurement, Radio Galaxies, Ubv Spectra

Scientific paper

Procedures used for the optical identification of the quasars from the Parkes 2700-MHz survey are discussed together with some radio and optical results. It is noted that this survey, which has added 450 quasars and possible quasars to the literature, was conducted at a relatively high frequency in order to determine the extent of those sources exhibiting enhancements at high frequencies or cutoffs to lower frequencies (the 'flat-spectrum' source population). About 75% of the quasars were identified using the standard overlay technique, while candidates for the other 25% were selected on the basis of their radio properties. A two-spectral-index diagram is introduced, and sources from the 3CR survey (quasars and radio galaxies) are plotted on it. The low-frequency-cutoff region of the diagram is found to be almost exclusively populated by quasars, which are generally dominated by one intense and compact radio-emission component coincident with the optical object. Since the radio morphology of these sources does not resemble that of the majority of radio galaxies, the 2700-MHz survey has yielded a clear distinction between quasars and radio galaxies. Some possible quasar pairs are briefly discussed.

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