Journal Article

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

Filiberto G. Braglia, Peter A. R. Ade, James J. Bock, Edward L. Chapin, Mark J. Devlin, Alastair Edge, Matthew Griffin, Joshua O. Gundersen, Mark Halpern, Peter C. Hargrave, David H. Hughes, Jeff Klein, Gaelen Marsden, Philip Mauskopf, Lorenzo Moncelsi, Calvin B. Netterfield, Henry Ngo, Luca Olmi, Enzo Pascale, Guillaume Patanchon, Kevin A. Pimbblet, Marie Rex, Douglas Scott, Christopher Semisch, Nicholas Thomas, Matthew D. P. Truch, Carole Tucker, Gregory S. Tucker, Elisabetta Valiante, Marco P. Viero and Donald V. Wiebe

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 2, pages 1187-1202
Published in print April 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI:
Submillimetre observations of galaxy clusters with the BLAST: the star formation activity in Abell 3112

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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 (BR) 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.

Keywords: galaxies: clusters: general; galaxies: clusters: individual: A3112; galaxies: evolution; galaxies: star formation; infrared: galaxies; submillimetre: galaxies

Journal Article.  9908 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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