TY - JOUR
T1 - Submillimetre observations of galaxy clusters with the BLAST
T2 - The star formation activity in Abell 3112
AU - Braglia, Filiberto G.
AU - Ade, Peter A.R.
AU - Bock, James J.
AU - Chapin, Edward L.
AU - Devlin, Mark J.
AU - Edge, Alastair
AU - Griffin, Matthew
AU - Gundersen, Joshua O.
AU - Halpern, Mark
AU - Hargrave, Peter C.
AU - Hughes, David H.
AU - Klein, Jeff
AU - Marsden, Gaelen
AU - Mauskopf, Philip
AU - Moncelsi, Lorenzo
AU - Netterfield, Calvin B.
AU - Ngo, Henry
AU - Olmi, Luca
AU - Pascale, Enzo
AU - Patanchon, Guillaume
AU - Pimbblet, Kevin A.
AU - Rex, Marie
AU - Scott, Douglas
AU - Semisch, Christopher
AU - Thomas, Nicholas
AU - Truch, Matthew D.P.
AU - Tucker, Carole
AU - Tucker, Gregory S.
AU - Valiante, Elisabetta
AU - Viero, Marco P.
AU - Wiebe, Donald V.
PY - 2011/4
Y1 - 2011/4
N2 - We present observations at 250, 350 and 500μm 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 500μm, 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.
AB - We present observations at 250, 350 and 500μm 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 500μm, 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.
KW - Galaxies: clusters: general
KW - Galaxies: clusters: individual: A3112
KW - Galaxies: evolution
KW - Galaxies: star formation
KW - Infrared: galaxies
KW - Submillimetre: galaxies
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U2 - 10.1111/j.1365-2966.2010.17973.x
DO - 10.1111/j.1365-2966.2010.17973.x
M3 - Article
AN - SCOPUS:79952714008
SN - 0035-8711
VL - 412
SP - 1187
EP - 1202
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -