The Evolution of Field Spiral Galaxies over the Past 8 Gyr

Details The Evolution of Field Spiral Galaxies over the Past 8 Gyr The Evolution of Field Spiral Galaxies over the Past 8 Gyr

2004-12-10

arxiv.org/abs/astro-ph/0412256v1

Astronomy and Astrophysics

Astrophysics

20 pages, 9 figures. To appear in "Reviews in Modern Astronomy", Vol. 18, S. Roeser (Ed.), Astronomische Gesellschaft 2004, ("

Scientific paper

We have performed a large observing campaign of intermediate-redshift disk galaxies including spectroscopy with the FORS instruments of the VLT and imaging with the Advanced Camera for Surveys onboard the HST. Our data set comprises 113 late-type galaxies in the redshift range 0.12mag in rest-frame B. This evolution would be at variance with the predictions from numerical simulations. On the other hand, the disks of the distant galaxies are, for a given Vmax, slightly smaller than those of their local counterparts, as expected for a hierarchical structure growth. Hence, the discrepancy between the observations and theoretical predictions would be limited to the properties of the stellar populations. A possible explanation could be the suppression of star formation in low-mass disks which is not yet properly implemented in models of galaxy evolution. (abridged)

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