An interstellar refraction model for the rapid radio polarization changes in the quasar 0917 + 624

Details An interstellar refraction model for the rapid radio polarization changes in the quasar 0917 + 624 An interstellar refraction model for the rapid radio polarization changes in the quasar 0917 + 624

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250l...1s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. L1-L4.

Astronomy and Astrophysics

Astronomy

9

Astronomical Polarimetry, Interstellar Matter, Quasars, Radio Sources (Astronomy), Radio Wave Refraction, Shock Wave Interaction, Astronomical Models, Polarization Characteristics, Scintillation

Scientific paper

The quasar 0917 + 624 is one of a set of 'rapid radio variables' with significant intraday variations. A 180 deg polarization-position-angle swing, which occurred within one day, is commonly thought to rule out nonintrinsic models for the source variations. A model which explains the position angle swing as due to refractive focusing from an interstellar shock moving across the line of sight is discussed. The aim is to demonstrate the possibility of an extrinsic explanation of the observations. A specific model which best reproduces the observed position angle swing assumes 0917 + 624 has a small component (less than 0.07 mas) whose polarization position angle is very different from that of the rest of the source; the shock lies at a distance of 100 pc, has a shock-front thickness of 0.04 AU, and a velocity of 178 km/s, while the line-of-sight electron column-density increases by 3 x 10 exp 14 cm/sq as the shock passes.

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