Panchromatic Estimation of Star Formation Rates in BzK Galaxies.

Details Panchromatic Estimation of Star Formation Rates in BzK Galaxies. Panchromatic Estimation of Star Formation Rates in BzK Galaxies.

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21723304k&link_type=abstract

American Astronomical Society, AAS Meeting #217, #233.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

We determine Star Formation Rates (SFRs) in a sample of color selected, star forming (sBzK) galaxies (KAB<21.8) in the Extended Chandra Deep Field - South (ECDF-S). To avoid AGN, we eliminate 12 percent of the original sample that have X-ray detections in Chandra catalogs. X-ray stacking, including in the 4 Ms CDF-S, shows that the remaining 597 sBzK galaxies are not dominated by obscured AGN. Galaxies are separated into bins of photometric redshift; average flux densities are measured with stacking analyses in Chandra (0.5-8 keV), Spitzer-MIPS (24, 70 micron), sub-millimeter (250, 350, 500 micron from BLAST, 870 micron from LESS), and radio (VLA 1.4 GHz and GMRT 610 MHz) data. We include averages of aperture fluxes in MUSYC UBVRIz'JHK images to determine UV-through-radio Spectral Energy Distributions (SEDs). We estimate SFR from SED fits to determine the total IR luminosity, and we compare SFR calibrations from X-ray, UV, 24 micron, FIR and radio wavebands. We compare radio and X-ray SFR calibrations to each other, and we find preferred calibrations for each waveband. We find consistency with our best estimator, SFRIR+UV, to within a factor of two for dust corrected UV and the preferred radio SFR calibration. Our results show that 24 micron-only and X-ray SFR estimates should be used with caution. We gratefully acknowledge support from the National Science Foundation and NASA via an archival Spitzer grant.

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