LoCuSS: Shedding new light on the massive lensing cluster Abell 1689 - The view from Herschel

C. P. Haines, G. P. Smith, M. J. Pereira, E. Egami, S. M. Moran, E. Hardegree-Ullman, T. D. Rawle, M. Rex

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We present wide-field Herschel/PACS observations of A 1689, a massive galaxy cluster at z = 0.1832, from our open time key programme. We detect 39 spectroscopically confirmed 100 μm-selected cluster members down to 1.5×1010 L. These galaxies are forming stars at rates in the range 1-10 M/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(Hα)∼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 μm-selected galaxies extending ∼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 languageEnglish (US)
Article numberL19
JournalAstronomy and astrophysics
Issue number7-8
StatePublished - Jul 16 2010


  • Galaxies: clusters: individual: Abell 1689
  • Galaxies: star formation
  • Galaxy: evolution
  • Infrared: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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