Low frequency variability of BL Lac

Details Low frequency variability of BL Lac Low frequency variability of BL Lac

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.255..384s&link_type=abstract

Nature, vol. 255, May 29, 1975, p. 384, 385. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astronomy

22

Extragalactic Radio Sources, Radiant Flux Density, Radio Astronomy, Astronomical Models, Low Frequencies, Quasars, Radio Galaxies, Radio Interferometers

Scientific paper

Observations of the variability of BL Lac at relatively long radio wavelengths are reported which were made at Jodrell Bank at 31 and 74 cm and conflict with the models of Van der Laan (1966) and Ozernoy and Sazonov (1969). It is noted that BL Lac is completely unresolvable at 31 and 74 cm and that significant variations of about 2 Jy have occurred in the flux density at these wavelengths. The activity of BL Lac is found to be well represented by a succession of discrete outbursts superimposed on some relatively stable 'quiescent' level. Values are assigned to the active and quiet components between 1.9 and 74 cm, and the spectra of the components are compared. It is shown that the activity of BL Lac at short wavelengths is in good agreement with the expanding cloud model and its application to ejected components, but conventional models fail to account for the long-wavelength activity.

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