Interstellar Refractive Scintillation and Intraday Polarization Angle Swings

Details Interstellar Refractive Scintillation and Intraday Polarization Angle Swings Interstellar Refractive Scintillation and Intraday Polarization Angle Swings

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005chjaa...5...27q&link_type=abstract

Chinese Journal of Astronomy and Astrophysics, Volume 5, Issue 1, pp. 27-40 (2005).

Astronomy and Astrophysics

Astrophysics

Scientific paper

Intraday polarization angle swings of ~180° observed in two sources (QSO 0917+624 and QSO 1150+812) are discussed in the framework of refractive interstellar scintillation by a continuous interstellar medium. Model-fits to the I , Q and U light curves were made for both sources. It is shown that for the case of 0917+624 both the intraday intensity variations and the polarization angle swing of ~180° could be explained consistently in terms of a four-component model, which comprises one steady and two scintillating polarized components and one further non-polarized scintillating component. The polarization angle swing of ~180° observed in 1150+812, which occurred when the polarized flux density was almost constant, could not be explained in terms of refractive scintillation by a continuous medium and might be due to other mechanisms (e.g., scintillation by interstellar clouds).

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