Nigerian Journal of Physics

Log in or Register to get access to full text downloads.

Remember me or Register

DOWNLOAD FULL TEXT Open Access  DOWNLOAD FULL TEXT Subscription or Fee Access

Rotation Measure Distribution in Compact Steep-steep Spectrum Sources

OA Ogungbenro, CE Akujor


We have used radio polarization data at different frequencies to obtain the rotation measure, RM, the source rest frame rotation measure, RM(1+z)2 and the spectral index, α in a sample of Compact Steepspectrum Sources (CSSs). The CSS quasar sub-sample has RM(1+z)2 median values of ~-15.01 and 14.13 for the jet and counter-jet sides respectively, while corresponding values for galaxies are ~ -3.23 and 5.86. Spectral index asymmetry was also found with median spectral index values of ~1.11 and 1.50 for the jet and counter-jet sides of the quasar sub-sample, and the galaxy sub-sample has corresponding values of ~0.95 and 1.23; while there is no significant correlation between rotation measure and spectral index. The asymmetries observed could be due to a combination of both intrinsic and orientation effects.

Keyword: Rotation Measure, Compact Steep-spectrum Sources, Galaxies, Quasar and Spectral Index.

AJOL African Journals Online