Panchromatic estimation of star formation rates in BzK galaxies at 1 < z < 3

Peter Kurczynski, Eric Gawiser, Minh Huynh, Rob J. Ivison, Ezequiel Treister, Ian Smail, Guillermo A. Blanc, Carolin N. Cardamone, Thomas R. Greve, Eva Schinnerer, Meg Urry, Paul Van Der Werf

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9 Scopus citations


We determine star formation rates (SFRs) in a sample of color-selected, star-forming (sBzK) galaxies (K AB < 21.8) in the Extended Chandra Deep Field-South. To identify and avoid active galactic nuclei, we use X-ray, IRAC color, and IR/radio flux ratio selection methods. Photometric redshift-binned, average flux densities are measured with stacking analyses in Spitzer-MIPS IR, BLAST and APEX/LABOCA submillimeter, VLA and GMRT radio, and Chandra X-ray data. We include averages of aperture fluxes in MUSYC UBVRIz′JHK images to determine UV-through-radio spectral energy distributions. We determine the total IR luminosities and compare SFR calibrations from FIR, 24 μm, UV, radio, and X-ray wavebands. We find consistency with our best estimator, SFRIR + UV, to within errors for the preferred radio SFR calibration. Our results imply that 24 μm only and X-ray SFR estimates should be applied to high-redshift galaxies with caution. Average IR luminosities are consistent with luminous infrared galaxies. We find SFRIR + UV for our stackedsBzKs at median redshifts 1.4, 1.8, and 2.2 to be 556 (random error), 74 8, and 154 17 Ṁyr-1, respectively, with additional systematic uncertainty of a factor of ∼2.

Original languageEnglish (US)
Article number117
JournalAstrophysical Journal
Issue number2
StatePublished - May 10 2012

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • galaxies: high-redshift
  • galaxies: statistics
  • infrared: general
  • radio continuum: general
  • submillimeter: general


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