The imacs cluster building survey. I. description of the survey and analysis methods

Augustus Oemler, Alan Dressler, Michael G. Gladders, Jane R. Rigby, Lei Bai, Daniel Kelson, Edward Villanueva, Jacopo Fritz, George Rieke, Bianca M. Poggianti, Benedetta Vulcani

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


The IMACS Cluster Building Survey uses the wide field spectroscopic capabilities of the IMACS spectrograph on the 6.5 m Baade Telescope to survey the large-scale environment surrounding rich intermediate-redshift clusters of galaxies. The goal is to understand the processes which may be transforming star-forming field galaxies into quiescent cluster members as groups and individual galaxies fall into the cluster from the surrounding supercluster. This first paper describes the survey: the data taking and reduction methods. We provide new calibrations of star formation rates (SFRs) derived from optical and infrared spectroscopy and photometry. We demonstrate that there is a tight relation between the observed SFR per unit B luminosity, and the ratio of the extinctions of the stellar continuum and the optical emission lines. With this, we can obtain accurate extinction-corrected colors of galaxies. Using these colors as well as other spectral measures, we determine new criteria for the existence of ongoing and recent starbursts in galaxies.

Original languageEnglish (US)
Article number61
JournalAstrophysical Journal
Issue number1
StatePublished - Jun 10 2013


  • galaxies: clusters: general
  • galaxies: evolution
  • galaxies: photometry
  • galaxies: star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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