Radio positions and optical identifications for a sample of southern flat-spectrum radio sources. II

Details Radio positions and optical identifications for a sample of southern flat-spectrum radio sources. II Radio positions and optical identifications for a sample of southern flat-spectrum radio sources. II

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..398w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 398-410. Research supported by Au

Astronomy and Astrophysics

Astronomy

11

Position (Location), Radio Astronomy, Radio Sources (Astronomy), Radio Spectra, Astronomical Catalogs, Astronomical Maps, Radio Telescopes, Southern Sky

Scientific paper

Presented here are optical identifications for southern radio sources using new arcsecond positions. These sources are all flat radio-spectrum sources stronger than 0.25 Jy at 2700 MHz. All lie between right ascension (RA) (B1950.0) 18h00m and O6h00m declination (Dec.) -80 deg and -50 deg (B1950.0). The radio positions have standard deviations of about 1.0 arcsec in both RA and Dec. The optical positions are with respect to the FK4 reference system as approximated by the Perth catalogs and have position uncertainties of 0.5 arcsec. Magnitude estimates are on the IIIa-J scale and are accurate to 0.4 mag for QSOs and 0.5 mag for galaxies. The sample is complete to the 22.5-mag limit of the SERC IIIa-J sky survey. There are 198 sources in the complete sample. Thirty-one sources (16 percent) show some radio structure with the 20-arcsec beam. For the 175 unresolved sources, there are 124 QSOs (71 percent), 26 galaxies (15 percent), and 25 empty fields (14 percent) suggested.

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