Submillimetre observations of galaxy clusters with the BLAST: the star formation activity in Abell 3112
- Creators
- Braglia, Filiberto G.
- Viero, Marco P.
Abstract
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 K_(S-)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 R_(500). Stacking also shows that the bulk of the submm emission arises in intermediate-mass galaxies with K_S magnitude ~1 mag fainter than the characteristic magnitude K^*_s. 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.
Additional Information
© 2010 The Authors. Monthly Notices of the Royal Astronomical Society © 2010 RAS. Accepted 2010 November 3. Received 2010 November 2; in original form 2010 March 9. Article first published online: 30 Dec. 2010. We acknowledge the support of the National Aeronautics and Space Administration (NASA) through grant numbers NAG5-12785, NAG5-13301 and NNGO-6GI11G, the NSF Office of Polar Programs, the Canadian Space Agency, the Natural Sciences and Engineering Research Council (NSERC) of Canada, and the UK Science and Technology Facilities Council (STFC). This research has been enabled by the use of WestGrid computing resources. FGB acknowledges Daniele Pierini for helpful discussions and the anonymous referee for their suggestions. This work is partly based on observations made at the Australian Astronomical Observatory with the Anglo-Australian Telescope. This research has made use of the NED, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the NASA. This publication makes use of data products from the 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the NASA and the National Science Foundation. This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with the NASA.Attached Files
Published - Braglia2011p13548Mon_Not_R_Astron_Soc.pdf
Supplemental Material - MNR_17973_sm_asciitable1.zip
Supplemental Material - MNR_17973_sm_latextable1.zip
Supplemental Material - MNR_17973_sm_pdftable1.zip
Files
Additional details
- Eprint ID
- 23433
- Resolver ID
- CaltechAUTHORS:20110422-154056480
- NAG5-12785
- NASA
- NNGO-6GI11G
- NASA
- NSF Office of Polar Programs
- Canadian Space Agency
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Science and Technology Facilities Council (STFC) (UK)
- NAG5-13301
- NASA
- Created
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2011-04-26Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field