[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5303/JKAS.2002.35.4.175

LYα LINE FORMATION IN HUBBLE-TYPE SPHERICAL OUTFLOWS IN STARBURST GALAXIES

AHN SANG-HYEON (Korea Institute for Advanced Study)
LEE HEE-WON (Department of Astronomy, Sejong University)

Publication Information

Journal of The Korean Astronomical Society / v.35, no.4, 2002 , pp. 175-185 More about this Journal

Abstract

Almost half of primeval galaxies show P-Cygni type profiles in the Ly $\alpha$ emission line. The main underlying mechanism for the profile formation in these systems is thought to be the frequency re-distribution of the line photons in expanding scattering media surrounding the emission source. A Monte Carlo code is developed to investigate the Ly $\alpha$ line transfer in an optically thick and moving medium with a careful consideration of the scattering in the damping wings. Typical column densities and expansion velocities of neutral hydrogen investigated in this study are $N_{H1}{\~}10^{17-20}\;cm^{-2}$ and ${\Delta}V{\~} 100 km\;s^{-1}$ . We investigate the dependence of the emergent profiles on the kinematics and on the column density. Our numerical results are applied to show that the damped Ly $\alpha$ absorbers may possess an expanding H I supershell with bulk flow of ${\~}200 km\;s^{-l}$ and H I column density $N_{H1}{\~}10^{19}\;cm^{-2}$ . We briefly discuss the observational implications.

Keywords

early Universe; galaxies: starburst; radiative transfer; line: formation; line: profiles;

Citations & Related Records

Times Cited By KSCI : 2 (Citation Analysis)

Reference
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