Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146...38k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. 38-58. Sponsorship: Nederlandse Organisatie voor Zuiv
Astronomy and Astrophysics
Astrophysics
117
Astronomical Photometry, Cosmology, Extragalactic Radio Sources, Radio Galaxies, Radio Stars, Astronomical Spectroscopy, Bivariate Analysis, Color-Magnitude Diagram, Elliptical Galaxies, Luminosity, Quasars, Radiant Flux Density, Red Shift
Scientific paper
The paper aims to contribute to the empirical understanding of faint radio galaxies at cosmological distances. The authors intend to achieve this by photometric and spectroscopic measurements of the optical identifications of very weak radio sources found in a recent deep survey with the Westerbork Synthesis Radio Telescope. Among 302 sources in the complete sample with S1.4GHz ⪆ 0.6 mJy, 171 reliable optical identifications were found on deep, multicolor Mayall 4 m plates. The authors discuss the characteristics of the radio galaxy sample by combining the optical and radio data in ways that enable the radio galaxies to be classified. For the giant elliptical class, it is investigated whether the data show evidence for evolution of the optical spectra. The authors discuss the quasars and the radio stars. The bivariate radio-optical flux density distribution is used to put constraints on the epoch-dependent radio luminosity function of weak radio galaxies.
Koo David C.
Kron Richard G.
Windhorst Rogier A.
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