H α-based star formation rates in and around z ∼0.5 EDisCS clusters

Jennifer R. Cooper, Gregory H. Rudnick, Gabriel G. Brammer, Tyler Desjardins, Justin L. Mann, Benjamin J. Weiner, Alfonso Aragón-Salamanca, Gabriella De Lucia, Vandana Desai, Rose A. Finn, Pascale Jablonka, Yara L. Jaffe, John Moustakas, Damien Sperone-Longin, Harry I. Teplitz, Benedetta Vulcani, Dennis Zaritsky

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We investigate the role of environment on star formation rates (SFRs) of galaxies at various cosmic densities in well-studied clusters. We present the star-forming main sequence for 163 galaxies in four EDisCS clusters in the range 0.4 < z < 0.7. We use Hubble Space Telescope/Wide Field Camera 3 observations of the H α emission line to span three distinct local environments: The cluster core, infall region, and external field galaxies. The main sequence defined from our observations is consistent with other published H α distributions at similar redshifts but differs from those derived from star formation tracers such as 24 m. We find that the Hα-derived SFRs for the 67 galaxies with stellar masses greater than the mass-completeness limit of M∗ > 109.75 M show little dependence on environment. At face value, the similarities in the SFR distributions in the three environments may indicate that the process of finally shutting down star formation is rapid, however, the depth of our data and size of our sample make it difficult to conclusively test this scenario. Despite having significant H α emission, 21 galaxies are classified as UVJ-quiescent and may represent a demonstration of the quenching of star formation caught in the act.

Original languageEnglish (US)
Pages (from-to)5382-5398
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Feb 1 2022


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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