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Title:
Dust Absorption Along the Line of Sight for High-Redshift Objects
Authors:
Trenti, M.; Stiavelli, M.
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , ), AB(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; , )
Publication:
The Astrophysical Journal, Volume 651, Issue 2, pp. 704-712. (ApJ Homepage)
Publication Date:
11/2006
Origin:
UCP
ApJ Keywords:
ISM: Dust, Extinction, Galaxies: High-Redshift, Galaxies: ISM, Galaxies: Intergalactic Medium
DOI:
10.1086/507593
Bibliographic Code:
2006ApJ...651..704T

Abstract

We estimate the optical depth distribution of dust present in absorption systems along the line of sight of high-redshift galaxies and the resulting reddening. We characterize the probability distribution of the transmission to a given redshift and the shape of the effective mean extinction law by means of analytical estimates and Monte Carlo simulations. We present our results in a format useful for applications to present samples of high-redshift galaxies and discuss the implications for observations with the James Webb Space Telescope. Our most realistic model takes into account the metallicity evolution of damped Lyα absorbers and predicts that the effects of dust absorption are modest: at redshift z>~5 the transmission is above 0.8 at an emitted wavelength λe=0.14 μm with probability 90%. Therefore, dust obscuration along the line of sight will affect only marginally observations at very high redshift.
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