Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..998m&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 998-1010.
Astronomy and Astrophysics
Astronomy
10
Quasars, Radio Sources (Astronomy), Astronomical Maps, Luminosity, Magnitude, Optical Properties, Radiant Flux Density, Red Shift, Tables (Data)
Scientific paper
Radio and optical data on samples of intermediate-strength GB/GB2 quasars and quasar candidates are presented. The optical B magnitudes of these objects are strongly dependent on radio flux density. About 40 percent of the objects have double or other extended structure, while about 60 percent are core-dominated. Extended double structures appear more common in higher-luminosity samples, while compact sources dominate low-luminosity samples. The most narrow distribution of spectral indices was found for the DII doubles. Core-dominated quasars contain both flat-spectrum cores and compact but rather steep-spectrum sources. The median linear sizes of GB/GB2 quasars vary from 70 kpc +15 or -10 kpc for double sources, 30 kpc + or - 15 kpc for core-dominated 1S and 2S morphologies, to less than 2 kpc + or - 1 kpc for unresolved and EX sources. The differences probably indicate different intrinsic physical conditions in the sources and their environments.
Condon James J.
Machalski J.
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