A complete sample of extragalactic radio sources at 1 Jy at 408 MHz. II - The optical observations

Astronomy and Astrophysics – Astronomy

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Astronomical Photography, Extragalactic Radio Sources, Flux Density, Charge Coupled Devices, Data Reduction, Galactic Clusters, Image Processing, Magnitude, Quasars, Sky Surveys (Astronomy)

Scientific paper

This is the second paper in a series investigating the properties of a complete sample of 59 B2 radio sources with flux densities between 1 and 2 Jy at 408 MHz. Here the results are presented of a deep optical survey of the fields of 47 of these sources which are unidentified or have faint identifications on the National Geographic-Palomar Sky Survey. The observations were made with the Hale 5-m telescope using a charge-coupled device detector and reach a limiting magnitude of approximately 23. The proportion of the sample with identifications brighter than 23 mag is estimated to be about 80%. The apparent magnitude distribution of galaxies peaks between 19 and 20 mag, while the distribution of QSOs (about 24% of the total) reaches a maximum between 20 and 21 mag. Some of the faintest identifications are possibly close associations of galaxies in the cores of distant clusters. The giant 'classical double' 0854 + 39 is the best example of this type.

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