LoCuSS : pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2

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http://hdl.handle.net/10138/308043

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Bianconi , M , Smith , G P , Haines , C P , McGee , S L , Finoguenov , A & Egami , E 2018 , ' LoCuSS : pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2 ' , Monthly Notices of the Royal Astronomical Society , vol. 473 , no. 1 , pp. L79-L83 . https://doi.org/10.1093/mnrasl/slx167

Title: LoCuSS : pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2
Author: Bianconi, M.; Smith, G. P.; Haines, C. P.; McGee, S. L.; Finoguenov, A.; Egami, E.
Contributor: University of Helsinki, Department of Physics
Date: 2018-01
Language: eng
Number of pages: 5
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/308043
Abstract: We report direct evidence of pre-processing of the galaxies residing in galaxy groups falling into galaxy clusters drawn from the Local Cluster Substructure Survey (LoCuSS). 34 groups have been identified via theirX-ray emission in the infall regions of 23 massive (<M-200 > = 10(15) M-circle dot) clusters at 0.15 <z <0.3. Highly complete spectroscopic coverage combined with 24 mu m imaging from Spitzer allows us to make a consistent and robust selection of cluster and group members including star-forming galaxies down to a stellar mass limit of M* = 2 x 10(10) M-circle dot. The fraction f(SF) of star-forming galaxies in infalling groups is lower and with a flatter trend with respect to clustercentric radius when compared to the rest of the cluster galaxy population. At R approximate to 1.3 r(200), the fraction of star-forming galaxies in infalling groups is half that in the cluster galaxy population. This is direct evidence that star-formation quenching is effective in galaxies already prior to them settling in the cluster potential, and that groups are favourable locations for this process.
Subject: galaxies: clusters: general
galaxies: evolution
galaxies: groups: general
galaxies: star formation
STAR-FORMATION HISTORIES
DARK-MATTER HALOES
X-RAY GROUPS
INFRARED GALAXIES
FORMATION RATES
RICH CLUSTERS
EVOLUTION
LUMINOSITY
ENVIRONMENT
MORPHOLOGY
115 Astronomy, Space science
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