Rapid Variability in the Southern Blazar PKS 0521-365

Details Rapid Variability in the Southern Blazar PKS 0521-365 Rapid Variability in the Southern Blazar PKS 0521-365

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.225..183r&link_type=abstract

Astrophysics and Space Science, Volume 225, Issue 2, pp.183-204

Astronomy and Astrophysics

Astrophysics

17

Scientific paper

We present an intrinsic interpretation for the recently reported radio variability in the southern blazar PKS 0521-365. A shockedjet model can account for the quasi-periodical variations in the flux density of the source by means of inhomogeneities in the electron density with a quasi-periodic distribution along a jet in which a relativistic strong shock is propagating. These inhomogeneities are naturally produced by the effects of Kelvin-Helmholtz instabilities in the hypersonic parsec scale jet. The quasi-linear evolution of the polarization position angle can be understood as an effect of the “illumination” of successive cross sections with different mean field orientation or as a consequence of the shock propagation through a turbulent region in the jet. The high brightness temperature problem introduced by the short timescale varibility is solved invocating relativistic boosting with a moderately small viewing angle in agreement with the known structure of the source. In this context, several parameters are estimated.

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