Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.602n&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
We investigate the effects of the UV background radiation (UVB) on galaxy formation by using the semi-analytic model including the photoionization process. We find that the UVB mainly affects the formation of dwarf galaxies. The number density of dwarf galaxies decreases compared to the case of no UVB when the UVB exists until the present epoch. On the contrary, massive galaxies are hardly affected because they are formed by mergers of small galaxies formed at high redshift when the effect of the UVB is negligible. On the other hand, when the UVB vanishes at a low redshift, the number density of small objects is hardly changed but the colour becomes bluer, because stars are newly formed after the UVB vanishes. Thus we can discriminate between the types of the evolution of the UVB by observing the evolution of the luminosity function and the colour distributions.
Gouda Naoteru
Nagashima Masahiro
Sugiura Norimasa
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