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Is there any pristine gas in nearby starburst galaxies?

Published online by Cambridge University Press:  01 June 2008

Vianney Lebouteiller  and
Daniel Kunth
Vianney Lebouteiller
Affiliation:
Center for Radiophysics and Space Research, Cornell University, Space Sciences Building, Ithaca, NY 14853-6801, USA email: vianney@isc.astro.cornell.edu
Daniel Kunth
Affiliation:
Institut dAstrophysique de Paris, UMR7095 CNRS, Universit Pierre & Marie Curie, 98 bis boulevard Arago, 75014 Paris, France email: kunth@iap.fr
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Abstract

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We derive the chemical composition of the neutral gas in the blue compact dwarf (BCD) Pox 36 observed with FUSE. Metals (N, O, Ar, and Fe) are underabundant as compared to the ionized gas associated with H ii regions by a factor ~7. The neutral gas, although it is not pristine, is thus probably less chemically evolved than the ionized gas. This could be due to different dispersal and mixing timescales. Results are compared to those of other BCDs observed with FUSE. The metallicity of the neutral gas in BCDs seems to reach a lower threshold of ~1/50 Z⊙ for extremely-metal poor galaxies.

Keywords

ISM: abundances(ISM:) HII regionsgalaxies: abundancesgalaxies: dwarfgalaxies: starburstgalaxies: ISMultraviolet: ISMultraviolet: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 278 - 282
Copyright
Copyright © International Astronomical Union 2008

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