Evolution of clouds in radio galaxy cocoons

Evolution of clouds in radio galaxy cocoons

This letter presents a numerical study of the evolution of an emission line cloud of initial density 10 cm, temperature 10 K, and size 200 pc, being overtaken by a strong shock wave. Whereas previous simple models proposed that such a cloud would either be completely destroyed, or simply shrink in size, our results show a different and more complex behaviour: due to rapid cooling, the cloud bre...

On the Escape of Cosmic Rays from Radio Galaxy Cocoons

The escape rate of cosmic ray (CR) particles from radio galaxy cocoons is a problem of high astrophysical relevance: e.g. if CR electrons are stored for long times in the dilute relativistic medium filling the radio cocoons (radio plasma in the following) they are protected against Coulomb losses and thus able to produce significant non-thermal Comptonisation signature on the CMB. On the other ...

Evolution of the Radio Loud Galaxy Population

A catalogue of 14453 radio–loud AGN with 1.4 GHz fluxes above 3.5 mJy in the redshift range 0.4 < z < 0.8, has been constructed from the cross–correlation of the NVSS and FIRST radio surveys with the MegaZ–LRG catalogue of luminous red galaxies derived from Sloan Digital Sky Survey imaging data. The NVSS provides accurate flux measurements for extended sources, while the angular resolution of F...

Host Galaxy Evolution in Radio-Loud AGNs: Evolution Analysis

Intergalactic Matter And Cocoons of Radio Galaxies

The cocoons surrounding powerful radio sources can be extensive if the jet that feeds the cocoon is light and supersonic. They have been shown to remain overpressured with respect to the ambient medium for most of the life time of the sources. The observed lobes of the radio sources form parts of these extensive cocoons. We show that observations of the lobes of giant radio sources allow one to...