Multifrequency light curves of low-frequency variable radio sources

Details Multifrequency light curves of low-frequency variable radio sources Multifrequency light curves of low-frequency variable radio sources

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1784a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, Dec. 1984, p. 1784-1798.

Astronomy and Astrophysics

Astronomy

38

Extragalactic Radio Sources, Light Curve, Radiant Flux Density, Radio Spectra, Variability, Astronomical Spectroscopy, Error Analysis, Radio Astronomy, Relativistic Effects, Synchrotron Radiation, Ultrahigh Frequencies, Very Long Base Interferometry

Scientific paper

Light curves for the low-frequency variable sources AO 0235 + 16, NRAO 140, PKS 1117 + 14, DA 406, CTA 102, and 3C 454.3, obtained in monthly observations at 318, 430, and 606 MHz using the 305-m telescope at Arecibo and in bimonthly observations at 880 MHz and 1.4 GHz using the 91-m Green Bank transit telescope during 1980-1983, are presented and analyzed. AO 0235 + 16 is found to have basically canonical variability which is attributed to relativistically moving evolving synchrotron components; but in the other sources, strong simultaneous variations at 318, 430, and 606 MHz are observed to be greatly diminished in amplitude at 880 MHz and 1.4 GHz, confirming the existence of the intermediate-frequency gap at about 1 GHz proposed by Spangler and Cotton (1981). The possibility that a second variability mechanism is active in these sources is explored.

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