Statistics – Methodology
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9931h&link_type=abstract
HST Proposal ID #9931
Statistics
Methodology
Hst Proposal Id #9931 Ism And Circumstellar Matter
Scientific paper
Wolfe and collaborators have recently developed a method for determining the star-formation rate in damped Lyman-alpha {DLA} systems. This method, which makes uses measurements of cooling from the [C II] 157.7 micron line {measured using UV absorption from the upper fine structure level} with a model for the interstellar thermal equilibrium of the gas, allows us to study star formation in high-redshift galaxies with an unbiased sampling of the luminosity function. While the method of Wolfe et al. allows us to probe cosmic star formation in a uniform way over all redshifts, the results are dependent on the applicability of the adopted dust model and general outline of interstellar physics. We will use archival STIS observations of the C II 1335.7 Ang fine structure line toward 30 stars in the Small Magellanic Cloud to test the method of Wolfe et al. in a well-known low-metallicity system. We will compare star formation rates derived using the Wolfe et al. method with those derived for the SMC from H-alpha and far-infrared measurements. We will also compare the radiation field inferred from the Wolfe et al. method with that derived using FUSE observations of molecular hydrogen excitation along the same sight lines. These checks will allow us to verify the validity of and quantify the systematics inherent to the Wolfe et al. methodology.
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