Resumen

ONUCHUKWU, C. C.; UBACHUKWU, A. A.  y  ODO, F. C.. Kinematic model for asymmetry: projected hotspot/lobe advance speed. Rev. mex. astron. astrofis [online]. 2014, vol.50, n.1, pp.93-101. ISSN 0185-1101.

We present a kinematic model for asymmetries in radio sources, which enabled an estimation of the projected hotspot/lobe advance speed for high-luminosity radio sources using the arm-length ratio (Q) and apparent flux ratio (R). We obtain a mean projected speed along the line of sight ‹β̅› = 0.15 ± 0.05 for all the sources in our sample, using the Q parameter and ‹β̅› ~ 0.12- 0.32 for ρ = 2α + 1 (where ρ is the electron energy spectrum index) using the R parameter. Our results indicate that the adopted model of brightness evolution of plasma element affects the values of projected speed. Regression analyses indicate that the estimated speeds using the Q and R parameters show some correlation with distance (L) and luminosity (P), especiallyfor quasars.

Palabras llave : galaxies [active]; galaxies [general]; galaxies [kinematics and dynamics]; methods [data analysis].