NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-24 T12:43:31 PDT
Help | Comment | NED Home

For refcode 1991A&A...241...22Z:
Retrieve 95 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
1991A&A...241...22Z The asymmetry of low- and high-redshift radio galaxies Stanislaw Zieba and Krzysztof T. Chyzy Astronomical Observatory of the Jagiellonian University, ul. Orla 171, PL-30244 Cracow, Poland Netherlands Foundation for Research in Astronomy, Postbus 2,7990 AA Dwingeloo, The Netherlands Received February 20, accepted May 5, 1990 Abstract. Using the published data on the GB/GB2 and 3C radio galaxies, we investigate the influence of the total radio luminosity and the redshift on the distributions of three structural parameters Q, M, L, which measure the asymmetry, bending and linear size of the radio source, respectively. We find that the high-redshift galaxies (z > 0.7) have much more asymmetrical and bent structures than do the high-luminosity low-redshift ones, and that among the low-redshift galaxies those that are more luminous have more symmetrical and straight structures than the weak ones. The numerical simulations consistently account for all of the observed properties using a model in which all variations of source structure are attributed to relative differences in the velocities of non-collinear plasmons (jets) simultaneously ejected in opposite directions from the core. The most probable reason for these velocity differences is the interaction between the plasmons and the galactic (intergalactic) medium, whose properties are modified essentially somewhere above z >= 0.7. The typical plasmon velocities are about 0.01c, if 10^-7^ yr is assumed as the standard plasmon age. Key words: radio galaxies - extragalactic radio sources
Retrieve 95 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home