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Abstract
We present wide-field Herschel/PACS observations of A1689, a massive galaxy cluster at z = 0.1832, from our open time key programme. We detect 39 spectroscopically confirmed 100 mu m-selected cluster members down to 1.5 x 10(10) L-circle dot. These galaxies are forming stars at rates in the range 1-10 M-circle dot/yr, and appear to comprise two distinct populations: two-thirds are unremarkable blue, late-type spirals found throughout the cluster; the remainder are dusty red sequence galaxies whose star formation is heavily obscured with A(H alpha) similar to 2 mag and are found only in the cluster outskirts. The specific-SFRs of these dusty red galaxies are lower than the blue late-types, suggesting that the former are in the process of being quenched, perhaps via pre-processing, the unobscured star formation being terminated first. We also detect an excess of 100 mu m-selected galaxies extending similar to 6 Mpc in length along an axis that runs NE-SW through the cluster center at >= 95% confidence. Qualitatively this structure is consistent with previous reports of substructure in X-ray, lensing, and near-infrared maps of this cluster, further supporting the view that this cluster is a dynamically active, merging system.
Original language | English |
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Pages (from-to) | L19 |
Journal | Astronomy and Astrophysics |
Volume | 518 |
DOIs | |
Publication status | Published - 1 Jul 2010 |
Keywords
- Galaxy: evolution
- infrared: galaxies
- galaxies: clusters: individual: Abell 1689
- galaxies: star formation
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Dive into the research topics of 'LoCuSS: Shedding new light on the massive lensing cluster Abell 1689-the view from Herschel'. Together they form a unique fingerprint.Projects
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Birmingham Astrophysics - Rolling Grant 2007-2012
Ponman, T., Cruise, M., Freise, A., Raychaudhury, S., Smith, G., Speake, C., Stevens, I. & Vecchio, A.
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/07 → 31/03/12
Project: Research Councils