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Panchromatic Estimation of Star Formation Rates in BzK Galaxies at 1<z<3

  • Kurczynski, Peter
  • Gawiser, Eric
  • Huynh, Minh
  • Ivison, Rob J.
  • Treister, Ezequiel
  • Smail, Ian
  • Blanc, Guillermo A.
  • Cardamone, Carolin N.
  • Greve, Thomas R.
  • Schinnerer, Eva
  • Urry, Meg
  • van der Werf, Paul
Publication Date
Apr 18, 2012
Submission Date
Oct 02, 2010
DOI: 10.1088/0004-637X/750/2/117
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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 micron, UV, radio and X-ray wavebands. We find consistency with our best estimator, SFR(IR+UV), to within errors for the preferred radio SFR calibration. Our results imply that 24 micron 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 SFR(IR+UV) for our stacked sBzKs at median redshifts 1.4, 1.8, and 2.2 to be 55+/-6 (random error), 74+/-8 and 154+/-17 Msun yr^-1 respectively, with additional systematic uncertainty of a factor of ~2.

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