Environmental Effects on the Star Formation Activity in Galaxies at z=1.2 in the COSMOS Field

Details Environmental Effects on the Star Formation Activity in Galaxies at z=1.2 in the COSMOS Field Environmental Effects on the Star Formation Activity in Galaxies at z=1.2 in the COSMOS Field

2009-05-25

arxiv.org/abs/0905.3982v2

Astrophys.J.700:971-976,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10pages, 5figures, accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/700/2/971

We investigate the relation between the star-formation activity in galaxies and environment at z=1.2 in the COSMOS field, using the fraction of [OII] emitters and the local galaxy density. The fraction of [OII] emitters appears to be almost constant over the surface density of galaxies between 0.2 and 10 Mpc^-2. This trend is different from that seen in the local universe where the star-formation activity is weaker in higher density regions. To understand this difference between z~1 and z~0, we study the fraction of non-isolated galaxies as a function of local galaxy density. We find that the fraction of non-isolated galaxies increases with increasing density. Our results suggest that the star formation in galaxies at z~1 is triggered by galaxy interaction and/or mergers.

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