Panchromatic Estimation of Star Formation Rates in BzK Galaxies at 1 < z < 3
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 μm, 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 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 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 M_☉ yr^(–1), respectively, with additional systematic uncertainty of a factor of ~2.
Additional Information
© 2012 American Astronomical Society. Received 2011 December 13; accepted 2012 February 29; published 2012 April 23. We acknowledge valuable conversations with and comments by Viviana Acquaviva, Eric Bell, Nicholas Bond, Lucia Guaita, Bret Lehmer, Felipe Menanteau, and Axel Weiss, and we thank LESS for providing the 870μm data, obtained from LABOCA APEX RUN IDs: 078.F-9028(A), 079.F-9500(A), 080.A-3023(A), and 081.F-9500(A). Support for this work was provided by the National Science Foundation under grants AST-0807570 and AST-1055919 and by NASA through an award issued by JPL/Caltech. E.G. thanks U.C. Davis for hospitality during the preparation of this manuscript. Support for the work of E.T. was provided by the National Aeronautics and Space Administration through Chandra Postdoctoral Fellowship Award Number PF8-90055 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory on behalf of the National Aeronautics and Space Administration under contract NAS8-03060.Attached Files
Published - Kurczynski2012p18276Astrophys_J.pdf
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Additional details
- Eprint ID
- 31709
- Resolver ID
- CaltechAUTHORS:20120530-102721436
- NSF
- AST-0807570
- NSF
- AST-1055919
- NASA/JPL/Caltech
- NASA Chandra Fellowship
- PF8-90055
- NASA
- NAS8-03060
- Created
-
2012-05-30Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)