Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203..935n&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, June 1983, p. 935-943. Research supported by the I
Astronomy and Astrophysics
Astronomy
34
Magnitude, Quasars, Red Shift, Data Reduction, Luminosity
Scientific paper
The 1981 and 1950 magnitudes of 64 optically selected quasars from the University of Michigan survey are compared. The present sample includes all possible candidates in a 84 square degree field, and is probably complete for strong line m of less than about 18 mag quasars. The method used is a combination of measuring image diameters on the POSS prints and Iris photometry, and the error associated with it is about 0.2 mag. Thirty-nine percent of the quasars in the sample have varied by more than 0.45 mag between 1950 and 1981. The incidence of variability is almost identical in two redshift subgroups with z greater than 1.7 and z less than 1.7, and there is no variability-redshift dependence. The present sample doubles the number of known z not less than 2 variables, and includes the highest redshift (z = 2.92) variable found yet. Optically selected quasars of all redshift seem to be similar to the radio selected ones in their light variation, and earlier claims to the contrary are probably due to selection effects.
Netzer Hagai
Sheffer Yaron
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