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ID: 559291.0, MPI für Astronomie / Publikationen_mpia
The 10k zCOSMOS: Morphological transformation of galaxies in the group environment since z ~1
Authors:Kovač, K.; Knobel, C.; Bolzonella, M.; Iovino, A.; Carollo, C. M.; Scarlata, C.; Sargent, M.; Cucciati, O.; Zamorani, G.; Pozzetti, L.; Tasca, L. A. M.; Scodeggio, M.; Kampczyk, P.; Peng, Y.; Oesch, P.; Zucca, E.; Finoguenov, A.; Contini, T.; Kneib, J. P.; Le Fèvre, O.; Mainieri, V.; Renzini, A.; Bardelli, S.; Bongiorno, A.; Caputi, K.; Coppa, G.; de la Torre, S.; de Ravel, L.; Franzetti, P.; Garilli, B.; Lamareille, F.; Le Borgne, J. F.; Le Brun, V.; Maier, C.; Mignoli, M.; Pello, R.; Perez Montero, E.; Ricciardelli, E.; Silverman, J. D.; Tanaka, M.; Tresse, L.; Vergani, D.; Abbas, U.; Bottini, D.; Cappi, A.; Cassata, P.; Cimatti, A.; Fumana, M.; Guzzo, L.; Koekemoer, A. M.; Leauthaud, A.; Maccagni, D.; Marinoni, C.; McCracken, H. J.; Memeo, P.; Meneux, B.; Porciani, C.; Scaramella, R.; Scoville, N. Z.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:The Astrophysical Journal
Journal Abbrev.:The Astrophysical Journal
Volume:718
Issue / Number:1
Start Page:86
End Page:104
Review Status:not specified
Audience:Experts Only
Abstract / Description:We study the evolution of galaxies inside and outside of the group environment since z = 1 using a large well-defined set of groups and galaxies from the zCOSMOS-bright redshift survey in the COSMOS field. The fraction of galaxies with early-type morphologies increases monotonically with MB luminosity and stellar mass and with cosmic epoch. It is higher in the groups than elsewhere, especially at later epochs. The emerging environmental effect is superposed on a strong global mass-driven evolution, and at z ~ 0.5 and log(M */M sun) ~ 10.2, the "effect" of the group environment is equivalent to (only) about 0.2 dex in stellar mass or 2 Gyr in time. The stellar mass function of galaxies in groups is enriched in massive galaxies. We directly determine the transformation rates from late to early morphologies, and for transformations involving color and star formation indicators. The transformation rates are systematically about twice as high in the groups as outside, or up to three to four times higher correcting for infall and the appearance of new groups. The rates reach values as high as 0.3-0.7 Gyr–1 in the groups (for masses around the crossing mass 1010.5 M sun), implying transformation timescales of 1.4-3 Gyr, compared with less than 0.2 Gyr–1, i.e., timescales >5 Gyr, outside of groups. All three transformation rates decrease at higher stellar masses, and must also decrease at lower masses below 1010 M sun which we cannot probe well. The rates involving color and star formation are consistently higher than those for morphology, by a factor of about 50%. Our conclusion is that the transformations that drive the evolution of the overall galaxy population since z ~ 1 must occur at a rate two to four times higher in groups than outside of them. Based on observations obtained at the European Southern Observatory (ESO) Very Large Telescope (VLT), Paranal, Chile, as part of the Large Program 175.A-0839 (the zCOSMOS Spectroscopic Redshift Survey).
Free Keywords:galaxies: clusters: general; galaxies: evolution; galaxies: high-redshift; galaxies: luminosity function; mass function; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010ApJ...718...86K [ID No:1]
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