Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p..82v&link_type=abstract
Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present our analysis of UV attenuation by internal dust of a large sample (N=906) of Lyman Break Galaxies (LBGs). Using spectral energy distributions (SEDs) from the PÉGASE galaxy spectral evolution models, we apply dust attenuation corrections to the G-R colours using the Witt & Gordon (2000) models for radiative transfer in dusty galactic environments to arrive at the UV attenuation factors. We show that the dust in the LBGs exhibit SMC-like characteristics rather than MW-like, and that the dust geometry in these systems is most likely represented by a clumpy shell configuration. We show that the attenuation factor exhibits a pronounced dependence on the luminosity of the LBG, a1600∝ (L/L&sun;)α, where 0.5≤α≤1.5. The exponent α depends on the initial parameters of the stellar population chosen to model the galaxies and the dust properties. We find that the luminosity-weighted average attenuation factor is likely to be in the range from 5.7-18.5, which is consistent with the upper limits to the star-formation rate at 2
Gordon Karl Douglas
Vijh Uma P.
Witt Adolf N.
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