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• W3105008446 abstract "(Abridged) We use 101 galaxies selected from the Nearby Field Galaxy Survey (NFGS) to investigate the effect of aperture size on the star formation rate, metallicity and reddening determinations for galaxies. We compare the star formation rate, metallicity and reddening derived from nuclear spectra to those derived from integrated spectra. For apertures capturing <20% of the B(26) light, the differences between nuclear and global metallicity, extinction and star formation rate are substantial. We calculate an `expected' star formation rate using our nuclear spectra and apply the commonly-used aperture correction method. The expected star formation rate overestimates the global value for early type spirals, with large scatter for all Hubble types, particularly late types. The differences between the expected and global star formation rates probably result from the assumption that the distributions of the emission-line gas and the continuum are identical. We discuss the implications of these results for metallicity-luminosity relations and star formation history studies based on fiber spectra. To reduce systematic and random errors from aperture effects, we recommend selecting samples with fibers that capture >20% of the galaxy light. For the Sloan Digital Sky Survey and the 2dFGRS, redshifts z>0.04 and z>0.06 are required, respectively, to ensure a covering fraction >20% for galaxies similar to the average size, type, and luminosity observed in our sample. Higher luminosity samples and samples containing many late-type galaxies require a larger minimum redshift to ensure that >20% of the galaxy light is enclosed by the fiber." @default.
• W3105008446 created "2020-11-23" @default.
• W3105008446 creator A5023960152 @default.
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• W3105008446 date "2005-03-01" @default.
• W3105008446 modified "2023-10-13" @default.
• W3105008446 title "Aperture Effects on Star Formation Rate, Metallicity, and Reddening" @default.
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• W3105008446 doi "https://doi.org/10.1086/428303" @default.
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