Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.247..166r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 247, NO. 1/NOV1, P. 166, 1990
Astronomy and Astrophysics
Astronomy
124
Scientific paper
This paper introduces a unifying model of galaxy formation which can answer two questions suggested by recent data on high-redshift galaxies. These concern the ages of, and star-formation history in distant radiogalaxies, and the nature of the large number of field galaxies, revealed by faint galaxy counts. First, we show that the arguments favouring small ages (a few 10^8^ yr) as a unique solution for high-redshift radiogalaxies are weak, and inconsistent with the IR Hubble diagram. Then, in a universe with the density parameter {OMEGA}_0_ = 1 favoured by the inflationary scenario, we introduce a new scheme based on number evolution in addition to pure luminosity evolution: present-day galaxies result from the merging of a large number of building blocks. Models of basic luminosity and colour evolution fit the current Hubble sequence and the comoving number of these blocks evolves as (1+z)eta^. Field galaxies observed in faint counts are fitted with an evolutionary factor η~1.5 in the observable redshift range (z<=4), while the most distant radiogalaxies would be objects accreting the available building blocks more rapidly than this average rate. Star formation can begin early in the blocks (at z>=5), while radio jets would only be responsible for current star formation. This would explain the alignment of optical images with the radio axes, and the more compact IR images. The dispersion of the IR Hubble diagram is consistent with such a model.
Guiderdoni Bruno
Rocca-Volmerange Brigitte
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