Star-formation rates of cluster galaxies: Nature vs nurture

Tatiana F. Laganá, M. P. Ulmer

Research output: Contribution to journalArticlepeer-review


We analyzed 17 galaxy clusters, and investigated, for the first time, the dependence of the SFR and sSFR as a function of projected distance (as a proxy for environment) and stellar mass for cluster galaxies in an intermediate-to-high redshift range (0.4 < z < 0.9). We used up to nine flux points (BVRIZYJHKs magnitudes), its errors and redshifts to compute Mstar, SFR and sSFR through spectral energy distribution fitting technique. We use a z-dependent sSFR value to distinguish star-forming (SF) from quiescent galaxies. To analyse the SFR and sSFR history we split our sample in two redshift bins: galaxies at 0.4 < z < 0.6 and 0.6 < z < 0.9. We separate the effects of environment and stellar mass on galaxies by comparing the properties of star- forming and quiescent galaxies at fixed environment (projected radius) and fixed stellar mass. For the selected spectroscopic sample of more than 500 galaxies, the well-known correlation between SFR and Mstar is already in place at z ∼ 0.9, for both SF and quenched galaxies. Our results are consistent with no evidence that SFinte intermediate-to- high redshift range, mass is the primary characteristic that drives SFR.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - May 30 2018


  • High redshift galaxy clusters
  • Specific star formation rate
  • Star-formation rate

ASJC Scopus subject areas

  • General

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