A Panoramic Mid-infrared Survey of Two Distant Clusters

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dc.creatorGeach, J. E.
dc.creatorSmail, Ian
dc.creatorEllis, R. S.
dc.creatorMoran, S. M.
dc.creatorSmith, G. P.
dc.creatorTreu, T.
dc.creatorKneib, J. -P.
dc.creatorEdge, A. C.
dc.creatorKodama, T.
dc.date2006-06-06
dc.date.accessioned2026-07-07T10:39:12Z
dc.date.available2026-07-07T10:39:12Z
dc.description(abridged) We present panoramic Spitzer MIPS 24um observations covering 9x9Mpc (25'x25') fields around two massive clusters, Cl0024+16 and MS0451-03, at z=0.39 and z=0.55. Our observations cover a very wide range of environments within these clusters, from high-density regions around the cores out to the turn-around radius. Cross-correlating the mid-infrared catalogs with deep optical and near-infrared imaging of these fields, we investigate the optical/near-infrared colors of the mid-infrared sources. We find excesses of mid-infrared sources with optical/near-infrared colors expected of cluster members in the two clusters and test this selection using spectroscopically confirmed 24um members. The much more significant excess is associated with Cl0024+16, whereas MS0451-03 has comparatively few mid-infrared sources. The mid-infrared galaxy population in Cl0024+16 appears to be associated with dusty star-forming galaxies (typically redder than the general cluster population by up to A_V~1-2 mags) rather than emission from dusty tori around active galactic nuclei (AGN) in early-type hosts. The inferred total-infrared star-formation rates in Cl0024+16 are typically >5x greater than those found from a similar Halpha survey, indicating significant obscured activity in the cluster population. We find evidence for strong evolution of the level of dust-obscured star-formation in dense environments out to z=0.5, analogous to the rise in fraction of optically-selected star-forming galaxies seen in clusters and the field out to similar redshifts. However, there are clearly significant cluster-to-cluster variations in the populations of mid-infrared sources, probably reflecting differences in the intracluster media and recent dynamical evolution of these systems.
dc.description13 pages, 6 figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0606110
dc.identifierhttp://arxiv.org/abs/astro-ph/0606110
dc.identifierAstrophys.J.649:661-672,2006
dc.identifierdoi:10.1086/506469
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180946
dc.subjectAstrophysics
dc.titleA Panoramic Mid-infrared Survey of Two Distant Clusters
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