Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21441715g&link_type=abstract
American Astronomical Society, AAS Meeting #214, #417.15; Bulletin of the American Astronomical Society, Vol. 41, p.687
Astronomy and Astrophysics
Astronomy
Scientific paper
Simple numerical simulations of helical radio jets in active galaxies are presented. Helical motion causes periodic changes in the direction of relativistic flow with respect to the line of sight. Motions of a simple radio component in helical motion are computed for different values of bulk Lorentz factor, direction of jet axis, jet radius, and helicity. Simulated multi-epoch radio maps are presented, and radio intensity and spectra are shown to vary with time. Motion on the plane of sky in these simiulations exhibit non-linear motion and varying apparent speeds. Radio components in helical jets can explain some of the variability on timescales from years to decades in the radio spectra of quasars and BL Lac objects. The properties of a sample of inverted-spectrum radio sources are compared to helical jet models. Also, the impact of these models on observed polarization and predictions to the foreground of Cosmic Microwave Background anisotropy experiments will be discussed.
Gordon Eli E.
Guerra Erick
Maria Giller
Pilkington S.
Piwowar Dan
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