Eight billion years of disk galaxy evolution: no galaxy is an island

Details Eight billion years of disk galaxy evolution: no galaxy is an island Eight billion years of disk galaxy evolution: no galaxy is an island

2006-04-19

arxiv.org/abs/astro-ph/0604407v1

Astronomy and Astrophysics

Astrophysics

6 pages, To appear in the proceedings of the "Island Universes: Structure and Evolution of Disk Galaxies" conference held in T

Scientific paper

We present a brief discussion of the evolution of disk galaxy stellar masses, sizes, rotation velocities, and star formation rates over the last eight billion years. Recent observations have failed to detect significant evolution in the stellar mass Tully-Fisher relation, stellar mass-size relation, and the stellar mass function of disk galaxies. Yet, most z<1 star formation is in disks, and this star formation would be expected to drive a rapid growth of the total stellar mass (and therefore mass function) of disks in the last eight billion years. Such a build-up is not seen; instead, a rapid build-up in the total stellar mass in non-star-forming spheroid-dominated galaxies is observed. Large numbers of disk-dominated galaxies are systematically shutting off their star formation and building up a spheroid (or losing a disk) in the epoch 0

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