The Gaseous Haloes of Evolving Galaxies - a Probe Using the Linear Sizes of Radio Sources

Details The Gaseous Haloes of Evolving Galaxies - a Probe Using the Linear Sizes of Radio Sources The Gaseous Haloes of Evolving Galaxies - a Probe Using the Linear Sizes of Radio Sources

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..237s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 247, NO.2/NOV15, P. 237, 1990

Astronomy and Astrophysics

Astronomy

25

Scientific paper

As galaxies form and evolve, their gaseous haloes are expected to undergo corresponding evolution. We examine here whether observations of the linear sizes of radio sources can be used to probe such evolution. For this purpose we first represent the gas density at various stages of galaxy formation and evolution by means of simple model density profiles, and then work out the expected linear sizes (l) of radio sources in these models. We find that the strong evolution of l with redshift z, l~(1+z)^-3^, deduced from observations of radio galaxies with z<1, can be understood if the gas density in the haloes of such galaxies was ~10 times larger at z~0.5 than at z~0. This predicts that radio galaxies may show much stronger X-ray haloes at higher z, which can be tested by future X-ray observations. For galaxies at the focus of group or cluster cooling flows, l is much smaller than for relatively isolated radio galaxies. Also, l evolves strongly with z for these galaxies, if such cooling flows were more vigorous in the past. Finally, l is expected to be much smaller for forming galaxies, by factors of ~10-100 depending on the luminosity of the source, compared to values seen in local radio galaxies. It may then be possible to deduce the epoch of vigorous galaxy formation by looking at radio linear sizes as a function of redshift.

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