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Submillimetre observations of galaxy clusters with the BLAST : the star formation activity in Abell 3112.

Braglia, F.G. and Ade, P.A.R. and Bock, J.J. and Chapin, E.L. and Devlin, M.J. and Edge, A. and Griffin, M. and Gundersen, J.O. and Halpern, M. and Hargrave, P.C. and Hughes, D.H. and Klein, J. and Marsden, G. and Mauskopf, P. and Moncelsi, L. and Netterfield, C.B. and Ngo, H. and Olmi, L. and Pascale, E. and Patanchon, G. and Pimbblet, K.A. and Rex, M. and Scott, D. and Semisch, C. and Thomas, N. and Truch, M.D.P. and Tucker, C. and Tucker, G.S. and Valiante, E. and Viero, M.P. and Wiebe, D.V. (2011) 'Submillimetre observations of galaxy clusters with the BLAST : the star formation activity in Abell 3112.', Monthly notices of the Royal Astronomical Society., 412 (2). pp. 1187-1202.


We present observations at 250, 350 and 500 μm of the nearby galaxy cluster Abell 3112 (z= 0.075) carried out with the Balloon-borne Large Aperture Submillimeter Telescope. Five cluster members are individually detected as bright submillimetre (submm) sources. Their far-infrared spectral energy distributions and optical colours identify them as normal star-forming galaxies of high mass, with globally evolved stellar populations. They all have (B−R) colours of 1.38 ± 0.08, transitional between the blue, active population and the red, evolved galaxies that dominate the cluster core. We stack to estimate the mean submm emission from all cluster members, which is determined to be 16.6 ± 2.5, 6.1 ± 1.9 and 1.5 ± 1.3 mJy at 250, 350 and 500 μm, respectively. Stacking analyses of the submm emission of cluster members reveal trends in the mean far-infrared luminosity with respect to clustercentric radius and KS-band magnitude. We find that a large fraction of submm emission comes from the boundary of the inner, virialized region of the cluster, at clustercentric distances around R500. Stacking also shows that the bulk of the submm emission arises in intermediate-mass galaxies with KS magnitude ∼1 mag fainter than the characteristic magnitude . The results and constraints obtained in this work will provide a useful reference for the forthcoming surveys to be conducted on galaxy clusters by Herschel.

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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2010 The Authors Monthly Notices of the Royal Astronomical Society © 2010 RAS Published by Oxford University Press on behalf of Monthly Notices of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:20 December 2013
Date of first online publication:April 2011
Date first made open access:No date available

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