Strong intraday variability in the southern blazar PKS 0537-441 at 1.42 GHz

Details Strong intraday variability in the southern blazar PKS 0537-441 at 1.42 GHz Strong intraday variability in the southern blazar PKS 0537-441 at 1.42 GHz

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..731r&link_type=abstract

Astronomy and Astrophysics 288, 731-737 (1994)

Astronomy and Astrophysics

Astrophysics

45

Bl Lacertae Objects: Pks 0521-365 And Pks 0537-441, Scattering, Ism: Clouds, Structure

Scientific paper

Results of intraday variability observations with a sampling of ~20 minutes of the southern blazars PKS 0521-365 and PKS 0537-441 at 1.42 GHz are presented. PKS 0521-365 did not display flux density variability whilst PKS 0537-441 showed strong fluctuations with a major outburst towards J.D. 2449011 caracterized by a fluctuation index of ~15%, variability amplitudes of ~45% and time scales of ~10^4^s. After a discussion of possible scenarios for such kind of variability, this extremely violent behaviour is interpreted in terms of strong scattering by compact ionized structures in the interstellar medium. The physical properties of the refractors are estimated from the observed light curves, and a brief discussion about the possible origin of these objects is presented.

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