Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..331a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 331-344. Research supported by the Science and Engin
Astronomy and Astrophysics
Astronomy
55
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.
Allington-Smith Jeremy R.
Gunn James E.
Longair Malcolm S.
Perryman Michael . A. C.
Westphal Andrew J.
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