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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559156.0, MPI für Astronomie / Publikationen_mpia
Star formation histories in a cluster environment at z ~ 0.84
Authors:Demarco, R.; Gobat, R.; Rosati, P.; Lidman, C.; Rettura, A.; Nonino, M.; van der Wel, A.; Jee, M. J.; Blakeslee, J. P.; Ford, H. C.; Postman, M.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:1
Start Page:1252
End Page:1276
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a spectrophotometric analysis of galaxies belonging to the dynamically young, massive cluster RX J0152.7-1357 at z ~ 0.84, aimed at understanding the effects of the cluster environment on the star formation history (SFH) of cluster galaxies and the assembly of the red sequence (RS). We use VLT/FORS spectroscopy, ACS/WFC optical, and NTT/SofI near-IR data to characterize SFHs as a function of color, luminosity, morphology, stellar mass, and local environment from a sample of 134 spectroscopic members. In order to increase the signal-to-noise ratio, individual galaxy spectra are stacked according to these properties. Moreover, the D4000, Balmer, CN3883, Fe4383, and C4668 indices are also quantified. The SFH analysis shows that galaxies in the blue faint-end of the RS have on average younger stars (Δt ~ 2 Gyr) than those in the red bright-end. We also found, for a given luminosity range, differences in age (Δt ~ 0.5-1.3 Gyr) as a function of color, indicating that the intrinsic scatter of the RS may be due to age variations. Passive galaxies in the blue faint-end of the
Free Keywords:galaxies: clusters: general; galaxies: clusters: individual: RX J0152.7–1357; galaxies: evolution; galaxies: formation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010ApJ...725.1252D [ID No:1]
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