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The Astrophysical Journal Volume 700 Number 2 Create an alert RSS this journal

Y. Ideue et al. 2009 ApJ 700 971 doi:10.1088/0004-637X/700/2/971

ENVIRONMENTAL EFFECTS ON THE STAR FORMATION ACTIVITY IN GALAXIES AT z sime 1.2 IN THE COSMOS FIELD*

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Y. Ideue1, T. Nagao1,2, Y. Taniguchi2, Y. Shioya2, T. Saito2, T. Murayama3, S. Sasaki1,3, J. R. Trump4, A. M. Koekemoer5, H. Aussel6, P. Capak7, O. Ilbert8, H. McCracken9, B. Mobasher10, M. Salvato7, D. B. Sanders8 and N. Scoville7

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Abstract References Cited By

We investigate the relation between the star formation activity in galaxies and environment at z sime 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.


Footnote
*  Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by AURA Inc, under NASA contract NAS 5-26555. Also based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratry, California Institute of Technology, under NASA contract 1407. Also based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan; the XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA; the European Southern Observatory under Large Program 175.A-0839, Chile; Kitt Peak National Observatory, Cerro Tololo Inter-American Observatory, and the National Optical Astronomy Observatory, which are operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation; and the Canada-France-Hawaii Telescope (CFHT) with MegaPrime/MegaCam operated as a joint project by the CFHT Corporation, CEA/DAPNIA, the NRC and CADC of Canada, the CNRS of France, TERAPIX, and the University of Hawaii.
Keywords

galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: interactions


Dates

Issue 2 (2009 August 1)

Received 2008 December 2, accepted for publication 2009 May 25

Published 2009 July 7



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