期刊
ASTROPHYSICAL JOURNAL
卷 751, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/751/1/54
关键词
galaxies: clusters: general; galaxies: dwarf; galaxies: evolution; galaxies: interactions; galaxies: star formation; ultraviolet: galaxies
资金
- Spanish Ministerio de Ciencia e Innovacion under FPI [BES-2005-7570]
- Spanish PNAYA [AYA2007-67965-C03-02, AYA2010-21887-C0401]
- Spanish MICINN [CSD2006 00070]
- NASA
- Alfred P. Sloan Foundation
- Participating Institutions
- National Science Foundation
- U.S. Department of Energy, NASA
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
In this work, we present the results of a novel approach devoted to disentangling the role of the environmental processes affecting galaxies in clusters. This is based on the analysis of the near-UV (NUV) - r' distributions of a large sample of star-forming galaxies in clusters spanning more than four absolute magnitudes. The galaxies inhabit three distinct environmental regions: virial regions, cluster infall regions, and field environment. We have applied rigorous statistical tests to analyze both the complete NUV - r' distributions and their averages for three different bins of the r'-band galaxy luminosity down to M-r' similar to -18, throughout the three environmental regions considered. We have identified the environmental processes that significantly affect the star-forming galaxies in a given luminosity bin by using criteria based on the characteristics of these processes: their typical timescales, the regions where they operate, and the galaxy luminosity range for which their effects are more intense. We have found that the high-luminosity (M-r' <= -20) star-forming galaxies do not show significant signs in their star formation activity of being affected by: (1) the environment in the last similar to 10(8) yr, or (2) a sudden quenching in the last 1.5 Gyr. The intermediate-luminosity (-20 < M-r' <= -19) star-forming galaxies appear to be affected by starvation in the virial regions and by the harassment in the virial and infall regions. Low-luminosity (-19 < M-r' <= -18.2) star-forming galaxies seem to be affected by the same environmental processes as intermediate-luminosity star-forming galaxies in a stronger way, which would be expected for their lower luminosities.
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