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LoCuSS: luminous infrared galaxies in the merging cluster Abell 1758 at z= 0.28

Haines, C. P. and Smith, G. P. and Egami, E. and Okabe, N. and Takada, M. and Ellis, R. S. and Moran, S. M. and Umetsu, K. (2009) LoCuSS: luminous infrared galaxies in the merging cluster Abell 1758 at z= 0.28. Monthly Notices of the Royal Astronomical Society, 396 (3). pp. 1297-1307. ISSN 0035-8711.

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We present the first galaxy evolution results from the Local Cluster Substructure Survey (LoCuSS), a multiwavelength survey of 100 X-ray selected galaxy clusters at 0.15 ≤z≤ 0.3 . LoCuSS combines far-ultraviolet (UV) through far-infrared (IR) observations of cluster galaxies with gravitational lensing analysis and X-ray data to investigate the interplay between the hierarchical assembly of clusters and the evolution of cluster galaxies. Here we present new panoramic Spitzer/Multiband Imaging Photometer 24-μm observations of the merging cluster Abell 1758 at z= 0.279 spanning 6.5 × 6.5 Mpc^2 and reaching a 90 per cent completeness limit of S_(24μm)= 400 μJy . We estimate a global cluster star formation rate of SFR_(24μm)= 910 ± 320 M_⊙ yr^(−1) within R < 3 Mpc of the cluster centre, originating from 42 galaxies with L_(8−1000 μm) > 5 × 10^(10) L_⊙ . The obscured activity in A1758 is therefore comparable with that in Cl 0024+1654, the most active cluster previously studied at 24 μm . The obscured galaxies faithfully trace the cluster potential as revealed by the weak-lensing mass map of the cluster, including numerous mass peaks at R∼ 2–3 Mpc that are likely associated with infalling galaxy groups and filamentary structures. However, the core (R≲ 500 kpc) of A1758N is ∼two times more active in the IR than that of A1758S, likely reflecting differences in the recent dynamical history of the two clusters. The 24-μm results from A1758 therefore suggest that dust-obscured cluster galaxies are common in merging clusters and suggest that obscured activity in clusters is triggered by both the details of cluster–cluster mergers and processes that operate at larger radii including those within in-falling groups. Our ongoing far-UV through far-IR observations of a large sample of clusters should allow us to disentangle the different physical processes responsible for triggering obscured star formation in clusters.

Item Type:Article
Related URLs:
URLURL TypeDescription
Haines, C. P.0000-0002-8814-8960
Smith, G. P.0000-0003-4494-8277
Ellis, R. S.0000-0001-7782-7071
Moran, S. M.0000-0002-9194-5071
Umetsu, K.0000-0002-7196-4822
Additional Information:2009 The Authors. Journal compilation. Accepted 2009 March 24. Received 2009 March 24; in original form 2008 December 12. CPH and GPS acknowledge financial support from STFC. GPS and RSE acknowledge support from the Royal Society. We acknowledge NASA funding for this project under the Spitzer program GO:40872. We wish to thank the staff at UKIRT, CASU and WFAU for making the observations and rapidly processing the NIR data.
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:galaxies: active; galaxies: clusters: general; galaxies: evolution; galaxies: stellar content
Issue or Number:3
Record Number:CaltechAUTHORS:20090828-103405348
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15401
Deposited By: Ruth Sustaita
Deposited On:14 Sep 2009 16:40
Last Modified:05 Nov 2019 23:34

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