ENVIRONMENTAL EFFECTS ON THE STAR FORMATION ACTIVITY IN GALAXIES AT z {approx_equal} 1.2 IN THE COSMOS FIELD

Journal Article · Sat Aug 01 00:00:00 EDT 2009 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/700/2/971; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21313836

Ideue, Y; Nagao, T; Sasaki, S ^[1]; Taniguchi, Y; Shioya, Y; Saito, T ^[2]; Murayama, T ^[3]; Trump, J R ^[4]; Koekemoer, A M ^[5]; Aussel, H ^[6]; Capak, P; Salvato, M; Scoville, N ^[7]; Ilbert, O; Sanders, D B ^[8]; McCracken, H ^[9]; Mobasher, B ^[10]

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1. Graduate School of Science and Engineering, Ehime University, Bunkyo-cho, Matsuyama 790-8577 (Japan)
2. Research Center for Space and Cosmic Evolution, Ehime University, Bunkyo-cho, Matsuyama 790-8577 (Japan)
3. Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578 (Japan)
4. Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States)
5. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
6. CEA/DSM-CNRS, Universite' Paris Diderot, DAP-NIA/SAp, Orme des Merisiers, 91191 Gif-sur-Yvette (France)
7. California Institute of Technology, MC 105-24, 1200 East California Boulevard, Pasadena, CA 91125 (United States)
8. Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States)
9. Institut d'Astrophysique de Paris, UMR 7095, CNRS, Universit Pierre et Marie Curie, 98 bis Boukevard Arago, F-75014 Paris (France)
10. Department of Physics and Astronomy, University of California, Riverside, CA 92521 (United States)

We investigate the relation between the star formation activity in galaxies and environment at z {approx_equal} 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{sup -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 {approx} 1 and z {approx} 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 {approx} 1 is triggered by galaxy interaction and/or mergers.

• OSTI ID: 21313836
• Journal Information: Astrophysical Journal, Vol. 700, Issue 2; Other Information: DOI: 10.1088/0004-637X/700/2/971; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
GALACTIC EVOLUTION
MILKY WAY
RED SHIFT
STARS
UNIVERSE