Environmental effects on the star formation activity in galaxies at z ≃ 1.2 in the cosmos field

Y. Ideue, T. Nagao, Y. Taniguchi, Y. Shioya, T. Saito, T. Murayama, S. Sasaki, J. R. Trump, A. M. Koekemoer, H. Aussel, P. Capak, O. Ilbert, H. McCracken, B. Mobasher, M. Salvato, D. B. Sanders, N. Scoville

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We investigate the relation between the star formation activity in galaxies and environment at z ≃ 1.2 in the Cosmic Evolution Survey field, using the fraction of [O II] emitters and the local galaxy density. The fraction of [O II] 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.

Original languageEnglish
Pages (from-to)971-976
Number of pages6
JournalAstrophysical Journal
Volume700
Issue number2
DOIs
Publication statusPublished - 2009

Keywords

  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: high-redshift
  • Galaxies: interactions

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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