Panchromatic Estimation Of Star Formation Rates In Bzk Galaxies At 1 < Z < 3

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Date

2012-05

Authors

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

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Abstract

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 mu m, 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 mu m 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 stacked sBzKs at median redshifts 1.4, 1.8, and 2.2 to be 55 +/- 6 (random error), 74 +/- 8, and 154 +/- 17 M-circle dot yr(-1), respectively, with additional systematic uncertainty of a factor of similar to 2.

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Kurczynski, Peter, Eric Gawiser, Minh Huynh, Rob J. Ivison, Ezequiel Treister, Ian Smail, Guillermo A. Blanc et al. "Panchromatic Estimation of Star Formation Rates in BzK Galaxies at 1< z< 3." The Astrophysical Journal, Vol. 750, No. 2 (May., 2012): 117.