Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-03
Astronomy and Astrophysics
Astrophysics
To appear in Bull. Astron. Soc. India; 10 pages, 3 Figures, basi.sty LaTex file
Scientific paper
We compare earlier estimates of the volumes filled by lobes of radio galaxies during the quasar era based upon non-evolving ambient media with new ones assuming a strong cosmological evolution of the ambient medium. If the sources remain active for over 10^8 years the volumes filled by them are found to be comparable for the two scenarios. This strengthens our earlier inference that much of the cosmic web of gaseous filaments, the site of galaxy formation, was probably permeated by radio lobes during the quasar era and this could have triggered extensive star formation and made large contributions to the spread of magnetic fields and metals through the universe by z ~ 2.
Barai Paramita
Gopal-Krishna
Osterman Margaret A.
Wiita Paul J.
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