Ultraviolet Spectra of Star-forming Galaxies with Time-dependent Dust Obscuration

Details Ultraviolet Spectra of Star-forming Galaxies with Time-dependent Dust Obscuration Ultraviolet Spectra of Star-forming Galaxies with Time-dependent Dust Obscuration

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...574..114l&link_type=abstract

The Astrophysical Journal, Volume 574, Issue 1, pp. 114-125.

Astronomy and Astrophysics

Astronomy

14

Galaxies: Ism, Galaxies: Starburst, Galaxies: Stellar Content, Ultraviolet: Galaxies

Scientific paper

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.

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