Journal
ASTROPHYSICAL JOURNAL
Volume 700, Issue 2, Pages 971-976Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/700/2/971
Keywords
galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: interactions
Categories
Funding
- Ministry of Education, Culture, Sports, Science, and Technology [10044052, 10304013]
- JSPS [15340059, 17253001, 19340046]
- Grants-in-Aid for Scientific Research [10044052, 10304013, 17253001, 19340046, 15340059] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908044] Funding Source: National Science Foundation
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We investigate the relation between the star formation activity in galaxies and environment at z similar or equal to 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 similar to 1 and z similar to 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 similar to 1 is triggered by galaxy interaction and/or mergers.
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