2002ApJ...574..114L -
Astrophys. J., 574, 114-125 (2002/July-3)
Ultraviolet spectra of star-forming galaxies with time-dependent dust obscuration.
LEITHERER C., CALZETTI D. and MARTINS L.P.
Abstract (from CDS):
We study the effect of time-dependent dust obscuration on synthetic ultraviolet line profiles of a young stellar population. If the youngest and most massive stars are more obscured than the older, less massive stars, the C IV λ1550 and other stellar wind lines are significantly diluted with respect to a simple foreground screen model for the dust. We propose to use stellar wind lines as a probe of the dust-obscuration model instead of the previously employed nebular emission lines. Since purely stellar diagnostics are utilized, uncertain assumptions on the nebular properties are unnecessary. Photoionization models demonstrate that the C IV λ1550 emission is typically dominated by stellar winds and nebular contamination is negligible. A first comparison with a galaxy sample observed with the Hopkins Ultraviolet Telescope favors a dust geometry affecting ionizing and nonionizing stars equally. We point out the need for higher quality data for a more rigorous comparison. The Hubble Space Telescope is capable of obtaining such data in the future.
Abstract Copyright:
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Journal keyword(s):
Galaxies: ISM - Galaxies: Starburst - Galaxies: Stellar Content - Ultraviolet: Galaxies
Simbad objects:
24
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