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Search for optical identifications in the 5C4 radio survey
Author(s) -
Fröhlich H.E.,
Tiersch H.
Publication year - 1978
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.19782990102
Subject(s) - quasar , sky , astrophysics , physics , galaxy , position (finance) , identification (biology) , red shift , astronomy , radio galaxy , object (grammar) , remote sensing , geography , computer science , artificial intelligence , botany , finance , economics , biology
With the aid of a statistical approach regarding only the nearest optical object to a given radio position we have found identification rates of nearly 30 per cent up to the blue and red limits of the Palomar Sky Survey prints covering the region of the 5C4 radio survey. Roughly 60 per cent of these identifications are blue starlike objects and therefore possible quasar candidates. The remainig identifications are galaxies. Probabilities for the first neighbours to be an optical counterpart and finding charts for highly reliable objects are given.