Singly-Peaked P-Cygni Type Lyα From Starburst Galaxies

Details Singly-Peaked P-Cygni Type Lyα From Starburst Galaxies Singly-Peaked P-Cygni Type Lyα From Starburst Galaxies

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jkas...36..145a&link_type=abstract

Journal of the Korean Astronomical Society, vol. 36, no. 3, pp. 145-148

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Cosmology: Radiative Transfer, Galaxies: Starburst

Scientific paper

P-Cygni type Lyα from starburst galaxies, either nearby galaxies or Lyman Break galaxies, are believed to be formed by galactic outflows such as galactic supershells or galactic superwinds. We develope a Monte Carlo code to calculate the Lyα line transfer in a galactic supershell which is expanding and formed of uniform and dusty neutral hydrogen gas. The escape of Lyα photons from the system is achieved by a number of back-scatterings. A series of emission peaks are formed by back-scatterings. When we observe P-Cygni type Lyα emissions of starforming galaxies, we can usually see merely singly-peaked emission. Hence the secondary and the tertiary emission humps should be destroyed. In order to do this, dust should be spatially more extended into the inner cavity than neutral supershell. We find that the kinematic information of the expanding supershell is conserved even in dusty media. We discuss the astrophysical applications of our results.

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