Results of a five-year program of multifrequency monitoring of low-frequency variable radio sources

Details Results of a five-year program of multifrequency monitoring of low-frequency variable radio sources Results of a five-year program of multifrequency monitoring of low-frequency variable radio sources

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...93..441m&link_type=abstract

The Astrophysical Journal: Supplement Series, vol. 93, no. 2, p. 441-453

Astronomy and Astrophysics

Astronomy

23

Polarization, Quasars, Radio Astronomy, Radio Sources (Astronomy), Stellar Evolution, Astronomical Spectroscopy, Faraday Effect, Radio Jets (Astronomy), Radio Telescopes, Scintillation, Stellar Spectra, Synchrotron Radiation

Scientific paper

We present the results of a detailed multifrequency monitoring program of low-frequency variable radio sources. This consists of light curves at 318, 430, 606, 880, and 1400 MHz over a 5 year period. The observations were carried out with the Arecibo 305 m radiotelescope and the Green Bank 91 m radio telescope. The spectral characteristics of the variations confirm the general picture that at least two mechanisms are responsible. The first is clearly intrinsic evolution of synchrotron-emitting components as it is manifested by variations that appear first and most strongly at high frequencies, subsequently drifting to lower frequencies with diminished amplitude. The more common type of low-frequency variability, however, dominates at frequencies below approximately 800 MHz, while the variations near 1 GHz are often quite weak. This spectral property is strong evidence that these variations are interstellar refractive scintillation.

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