Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..611m&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.53, No. 4, pp. 611-628
Astronomy and Astrophysics
Astronomy
2
Galaxies : Evolution, Galaxies : Formation, Galaxies : Irregular, Galaxies : Photometry
Scientific paper
We have investigated whether the pure luminosity evolution (PLE) model in a flat universe with cosmological constant Λ can explain the faint blue galaxy (FBG) problem in light of recent observations of a morphologically divided number count, redshift distribution, and color distribution. While the original FBG problem means an inconsistency between the total number count and redshift distribution at around B > 22 mag, we consider here the FBG problem in a broader context. In particular, we pay attention to an evolution model of irregular galaxies, of which predictions from the standard model disagree with recent observations. In addition to the standard `S model' with slow star formation, we introduce a non-standard `R model' with rapid star formation for irregular galaxies, and investigate the properties of the sum of these models (S+R model). The observed total number count and redshift distribution in the B-band can be well reproduced by the PLE model in a Λ-dominated universe. As for irregular galaxies, while the S model underproduces the observed count, the S+R model can account for the observation. Considering that the observed color distribution of faint irregular galaxies is very broad, we propose a possibility that irregular galaxies are composed of at least two populations.
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