Optical identifications of faint ultra-steep spectrum radio sources

Details Optical identifications of faint ultra-steep spectrum radio sources Optical identifications of faint ultra-steep spectrum radio sources

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...93..399w&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 93, no. 3, June 1992, p. 399-417.

Astronomy and Astrophysics

Astronomy

9

Galactic Evolution, Optical Emission Spectroscopy, Radio Galaxies, Radio Sources (Astronomy), Sky Surveys (Astronomy), Very Large Array (Vla), Calibrating, Charge Coupled Devices, Faint Objects, High Resolution

Scientific paper

The first results are reported of an observational study of ultrasteep spectrum (USS) radio sources selected on the basis of Westerbork surveys at 327 MHz complemented by observations at 608 MHz. The study extends the sample of USS sources to sources about 25 times fainter than the 4C sample. The reduction and calibration, optical imaging and spectroscopy, radio sample selection and properties, and optical identifications are discussed. Statistical properties of the sample are investigated, including the magnitude distribution, variations of the identification fraction with spectral index, optical morphology, radio optical position angle differences, and optical spectra. The decrease of the identification fraction with steepening spectral index observed in the 4C sample is present in this sample also. No evidence is found for alignment between the optical and radio axes, and no strong emission lines are found in a subsample for which low-resolution spectroscopy was obtained.

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