NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-07-18 T19:21:52 PDT
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For refcode 2009MNRAS.396.1297H:
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Copyright by Royal Astronomical Society. 2009MNRAS.396.1297H LoCuSS: luminous infrared galaxies in the merging cluster Abell1758 at z = 0.28 Haines, C. P.; Smith, G. P.; Egami, E.; Okabe, N.; Takada, M.; Ellis, R. S.; Moran, S. M.; Umetsu, K. Abstract. 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-micron observations of the merging cluster Abell1758 at z = 0.279 spanning 6.5 x 6.5Mpc^2^ and reaching a 90 per cent completeness limit of S_24 micron_ = 400{mu}Jy. We estimate a global cluster star formation rate of SFR_24 micron_ = 910 +/- 320M_sun_yr^-1^ within R < 3Mpc of the cluster centre, originating from 42 galaxies with L_8-1000 micron_ > 5 x 10^10^L_sun_. The obscured activity in A1758 is therefore comparable with that in Cl0024+1654, the most active cluster previously studied at 24 micron. 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 ~ 2-3Mpc that are likely associated with infalling galaxy groups and filamentary structures. However, the core (R <~ 500kpc) 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-micron 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. Key words: galaxies: active - galaxies: clusters: general - galaxies: evolution - galaxies: stellar conten
Retrieve 12 NED objects in this reference.
Please click here for ADS abstract

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