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Local Lyman alpha emitters and their relevance to high-redshift star-forming galaxies
Stockholm University, Faculty of Science, Department of Astronomy.
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2009 (English)In: Astrophysics and Space Science, ISSN 0004-640X, E-ISSN 1572-946X, Vol. 320, no 1-3, 35-38 p.Article in journal (Refereed) Published
Abstract [en]

The Ly alpha line is an important diagnostic of star formation and activity in galaxies. The analysis of Ly alpha is complicated due to the resonant nature of the line and radiative transfer effects. High spectral resolution studies of local starburst galaxies with the unprecedented UV capabilities of the HST have shown that this line is either seen in absorption or in emission and in the latter case with a P Cygni profile indicative of a large scale outflow of neutral gas. Moreover, HST imaging obtained with HST-ACS of a sample of 6 star-forming galaxies has revealed that a substantial fraction of the Ly alpha photons are diffused far away from the emissive knots. Since the importance of Ly alpha for tracing large scale structure, correlation functions, and galaxy formation is recognized, Ly alpha will remain a very important probe of the distant universe for the foreseeable future, and it is therefore imperative to acquire a better understanding of what mechanisms regulate our ability to detect this line.

Place, publisher, year, edition, pages
2009. Vol. 320, no 1-3, 35-38 p.
Keyword [en]
Galaxies: starburst, Galaxies: high-redshift, Galaxies: star clusters, Ultraviolet: galaxies
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-17925DOI: 10.1007/s10509-008-9910-8OAI: diva2:184446
Available from: 2009-01-22 Created: 2009-01-22 Last updated: 2012-08-10Bibliographically approved

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Östlin, Göran
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