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Title:
A Comparison of UV and Hα Star Formation Rates In Intermediate Redshift Galaxies
Authors:
Walton, Josiah; Salim, S.; Lee, J.; Ly, C.; Finn, R.; Moore, C.; Dale, D.; McCarthy, D.; Kulesa, C.; Kennefick, J.
Affiliation:
AA(University of Arkansas), AB(NOAO), AC(OCIW), AD(UCLA), AE(Siena College), AF(University of Wyoming), AG(University of Wyoming), AH(University of Arizona), AI(University of Arizona), AJ(University of Arkansas)
Publication:
American Astronomical Society, AAS Meeting #213, #424.03; Bulletin of the American Astronomical Society, Vol. 41, p.246
Publication Date:
01/2009
Origin:
AAS
Bibliographic Code:
2009AAS...21342403W

Abstract

We present results of a study which directly compares star formation rates (SFRs) based on two commonly used indicators, the UV non-ionizing continuum and H-alpha nebular emission, for star-forming galaxies at z 0.8. Using UV data from the GALEX ultra-deep imaging survey in the Extended Groth Strip (EGS), Hubble Deep Field North (HDFN), and COSMOS fields, we construct a PSF-based UV flux catalog, which effectively deals with object blending. In the EGS and HDFN regions, we extract H-alpha fluxes from new near-IR (NIR) narrowband imaging observations obtained with the PISCES NIR camera on the 2.3m Bok telescope on Kitt Peak. For the COSMOS field, H-alpha fluxes are extracted from new NIR narrowband imaging observations taken with the NEWFIRM NIR camera on the Kitt Peak 4m. From the rest-frame far-UV flux and UV slope, we calculate dust-corrected UV SFRs. We also calculate SFRs from H-alpha fluxes, corrected for 1 magnitude of extinction. For galaxies at z 0.8, we examine the correlation between dust-corrected UV and H-alpha SFRs, and compare with previous results at lower redshifts. Walton's research was supported by the NOAO/KPNO Research Experiences for Undergraduates (REU) Program which is funded by the National Science Foundation through Scientific Program Order No. 3 (AST-0243875) of the Cooperative Agreement No. AST-0132798 between the Association of Universities for Research in Astronomy (AURA) and the NSF, and The Observatories of the Carnegie Institute of Washington.
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