Attenuation of Lyman-alpha emission by dust in damped Lyman-alpha systems

Astronomy and Astrophysics – Astrophysics

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Cosmic Dust, Galactic Evolution, Interstellar Extinction, Interstellar Matter, Lyman Alpha Radiation, Star Formation Rate, Ultraviolet Absorption, Absorption Spectra, Brightness Distribution, Limb Darkening, Photons, Quasars, Radiative Transfer

Scientific paper

Relations between the Ly-alpha surface brightness, star formation rate, and abundance of dust in damped Ly-alpha absorption systems are derived. For the dust-to-gas ratio in the damped Ly-alpha systems, the typical value inferred from the reddening of background quasars is adopted. The results of several recent searches from Ly-alpha emission are used to set limits on and estimate the star formation rate per unit area of the damped Ly-alpha systems. When the H I column density exceeds 5 x 10 to the 20th/sq cm, the attenuation of Ly-alpha emission is large and the star formation rate can be one or two orders of magnitude higher than that in the solar neighborhood. The large uncertainties are caused by the unknown orientations of the damped Ly-alpha systems and the unknown distributions of stars, gas, and dust within them. When the density is less than 5 x 10 to the 20th/sq cm, the attenuation is smaller and the limits on or value of the star formation rate per unit are similar to that in the solar neighborhood, i.e., a few solar masses/Gyr/sq pc.

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