A multifrequency study of radio intensity variations for active galactic nuclei of different optical classes

Details A multifrequency study of radio intensity variations for active galactic nuclei of different optical classes A multifrequency study of radio intensity variations for active galactic nuclei of different optical classes

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..297g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 297-303.

Astronomy and Astrophysics

Astrophysics

8

Active Galactic Nuclei, Emission Spectra, Extragalactic Radio Sources, Quasars, Radio Emission, High Frequencies, Interstellar Matter, Radiant Flux Density, Scintillation

Scientific paper

A study of radio intensity variations at seven frequencies in the range 0.3 to 90 GHz for compact extragalactic radio sources classified as BL Lacs and high- and low-optical polarization quasars (HPQs and LPQs) is presented. This include the results of flux-density monitoring of 33 compact sources for three years at 327 MHz with the Ooty Synthesis Radio Telescope. The degrees of 'short-term' (tau less than about 1 yr) variability for the three optical types are found to be indistinguishable at low frequencies (less than 1 GHz), pointing to an extrinsic origin for the low-frequency variability. At high frequencies, a distinct dependence on optical type is present, the variability increasing from LPQs, through HPQs to BL Lacs. This trend persists even when only sources with ultra-flat radio spectra (alpha greater than -0.2) are considered. Implications of this for the phenomenon of high-frequency variability and the proposed unification schemes for different optical types of active galactic nuclei are discussed.

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