Star Formation and Merging in Massive Galaxies at z < 2

Details Star Formation and Merging in Massive Galaxies at z < 2 Star Formation and Merging in Massive Galaxies at z < 2

2008-06-14

arxiv.org/abs/0806.2405v1

Astronomy and Astrophysics

Astrophysics

Five pages, to appear in "Panoramic Views of Galaxy Formation and Evolution"

Scientific paper

Observing massive galaxies at various redshifts is one of the most straightforward and direct approaches towards understanding galaxy formation. There is now largely a consensus that the massive galaxy (M_* > 10^11 M_0) population is fully formed by z~1, based on mass and luminosity functions. However, we argue that the latest data can only rule out number and mass density evolution of a factor of > 2-3 at z < 1.5. We furthermore show that the star formation history of M_* > 10^11 M_0 galaxies reveals that 40+/-5% of galaxies with M_* > 10^11 M_0 at z~1 are undergoing star formation that effectively doubles their stellar mass between z = 0.4 - 1.4. These massive galaxies also undergo 0.9^+0.7_-0.5 major mergers during this same time period.

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