Rapid polarization variations at 20 cm in 0917+624

Details Rapid polarization variations at 20 cm in 0917+624 Rapid polarization variations at 20 cm in 0917+624

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..770q&link_type=abstract

Astronomy and Astrophysics, v.367, p.770-779 (2001)

Astronomy and Astrophysics

Astrophysics

11

Galaxies: Compact, Polarization, Scattering, Radiation Mechanisms: Non-Thermal, Quasars: Individual: 0917+62

Scientific paper

The intraday variations (IDV hereafter) of the total and the polarized flux density observed at 20 cm in 0917+624 (in May 1989) are analysed. It is shown that the IDV can be interpreted in terms of refractive interstellar scintillation. The observed variations are dominated by one scintillating component with a timescale tau ~0.6 days and a scintillation index m~0.04. In addition, one more scintillating component with a shorter timescale and a smaller scintillation index is needed to improve the fit to the observed Q- and U-light curves. The relationship between the scintillating components and the VLBI components are also discussed. It is shown that Doppler beaming of the 20 cm scintillating components with a Lorentz factor >_ ~ 7 may be needed to reduce their intrinsic brightness temperatures significantly below the inverse-Compton limit.

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