Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983japa....4..109s&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 4, June 1983, p. 109-115.
Astronomy and Astrophysics
Astronomy
4
Angular Distribution, Astronomical Spectroscopy, Extragalactic Radio Sources, Quasars, Radio Sources (Astronomy), Red Shift
Scientific paper
The large-scale angular distribution of quasars from a complete sample of extragalactic radio sources is examined at different redshifts. The sample contains 264 quasars which have been found so far among the complete sample of 518 radio sources stronger than 1 Jy at 5 GHz. Of these, 19 quasars have redshift z greater than 2. Dividing the entire sky into three separate declination zones of equal area, the counts of quasars seem to indicate a deficit of high redshift quasars in the northernmost declination zone. On the other hand, the low-redshift quasars (z less than or approximately equal to 1) appear fairly uniformly distributed. Some possible selection effects that might have led to the apparent anomaly at high redshifts are discussed, and the expected number of high-redshift quasars amongst the radio sources in the sample for which redshifts are presently not available is estimated.
Gopal-Krishna
Shastri Prajval
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