Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..486c&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Dec. 1, 1980, p. 486-491.
Astronomy and Astrophysics
Astronomy
4
Quasars, Radiant Flux Density, Radio Astronomy, Astronomical Maps, Astronomical Spectroscopy, Radio Spectra
Scientific paper
Most QSOs found by low-resolution spectroscopy are known to be radio-quiet, but QSOs selected by polarization, power-law continuum spectra, or optical variability might have different radio characteristics. A sample of 96 QSOs and other blue objects has been observed, chosen on the basis of optical variability, with the VLA at 4885 MHz. Only three were detected (LB 8755, LB 8956, and LB 9013), and two of these (LB 8755 = OJ 180 and LB 9013 = 4C 17.46) had previously been found in radio-selected samples. For the rest, 5 sigma upper limits of 2.0 mJy can be placed on their 4885 MHz flux densities. The radio-to-optical luminosity ratios of the variable components of these QSOs are more than two orders of magnitude lower than those of radio-selected QSOs. Although the detection rate is low, the detected QSOs are among the most variable in the sample observed.
Condon James J.
Condon M. A.
Mitchell Kenneth J.
Usher Peter D.
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