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Detection of Escaping Lyman Continuum Radiation in Two Local Starbursts Using FUSE

Published online by Cambridge University Press:  01 August 2006

E. Leitet ,
N. Bergvall ,
B-G Andersson  and
E. Zackrisson
E. Leitet
Affiliation:
Uppsala Astronomical Observatory, Sweden, e-mail: elisabet.leitet@astro.uu.se
N. Bergvall
Affiliation:
Uppsala Astronomical Observatory, Sweden, e-mail: nils.bergvall@astro.uu.se
B-G Andersson
Affiliation:
Dept. of Physics and Astronomy, Johns Hopkins University, USA, e-mail: bg@pha.jhu.edu
E. Zackrisson
Affiliation:
Tuorla Observatory, Finland, e-mail: ez@astro.uu.se
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Abstract

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We present the detection of escaping Lyman Continuum (LyC) radiation from two local starburst galaxies, Tol 1247-232 and Tol 0440-381, using archival data from the Far Ultraviolet Spectroscopic Explorer (FUSE). From profile fitting of metal lines, high densities of neutral gas were derived for both galaxies, implying that the LyC radiation is escaping from holes in the interstellar medium. The first results for one of the galaxies, Tol 1247-232, give an escape fraction (fesc) of 17–35%. These new detections, together with that of the blue compact galaxy Haro 11 in Bergvall et al. (2006) where fesc between 4–10% was found, will have a feedback on cosmic reionization models.

Keywords

galaxies: evolution-starburstcosmology: diffuse radiationultraviolet: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 316
Copyright
Copyright © International Astronomical Union 2007

References

Bergvall, N., Zackrisson, E., Andersson, B-G 2006, A&A 448, 513.Google Scholar
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Heckman, T.M., Sembach, K.R., Meurer, G.R. 2001, ApJ 558, 56.CrossRefGoogle Scholar
Shapley, A., Steidel, C., Pettini, M. 2006, astr-ph/0606635.Google Scholar