Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9151i&link_type=abstract
HST Proposal ID #9151
Computer Science
Hst Proposal Id #9151 Galaxies
Scientific paper
We propose to obtain FUV and NUV images of nearby emission- line galaxies with existing star-formation rate {SFR} measurements from their HAlpha flux. Recently, the use of the UV flux as a measure of SFR has gained much popularity for estimating SFRs at different cosmic epochs {0 < z < 5}. However, the SFR estimated from UV flux could be greatly biased due to dust extinction. The KPNO International Spectroscopic Survey {KISS} provides a large sample of nearby HAlpha-selected starforming galaxies for which rich optical spectra are available for measuring metallicity and dust extinction through line ratios. By observing a subset of nearby emission-line galaxies in the KISS sample with the STIS FUV and NUV MAMA, a direct comparison between UV and HAlpha SFR estimates will be possible. This will allow us to understand the effect of dust extinction on UV flux for star- forming galaxies over a wide range of HAlpha luminosity {10^39-43 erg/sec}, metallicity {0.1 to 2 * solar}, absolute magnitude {-14 to -21}, and B-V color {0.2 to 1.2}. A rough dust extinction curve will be constructed for such objects, making it possible to test plausible dust extinction curves used in previous SFR studies of the distant universe. Also, high-resolution UV images will allow us to search for plausible local counterparts to high redshift galaxies whose rest-frame UV morphology is available from existing optical HST data.
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