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Rotationally Excited H2 in the Magellanic Clouds

Published online by Cambridge University Press:  21 March 2013

Rui Xue ,
Daniel Welty  and
Tony Wong
Rui Xue
Affiliation:
Dept. of Astronomy, Univ. of Illinois, USA, [email protected]
Daniel Welty
Affiliation:
Astronomy & Astrophysics Center, Univ. of Chicago, USA
Tony Wong
Affiliation:
Dept. of Astronomy, Univ. of Illinois, USA, [email protected]
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Abstract

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We have performed a survey study of rotational excited-state H2 Lyman-Werner absorption lines in the entire FUSE Magellanic Clouds Legacy archive. These lines reflect the UV pumping and formation conditions of H2, enabling a more comprehensive study of H2 gas properties, e.g. J-level populations N(J) and b-values (generally indicating the velocity dispersion). Combining with our previous measurements of N(Hi) and N(H2), we derived H2 excitation temperatures, gas volume density n(H), and local UV radiation field strength IUV for each sight line. The results indicate a weaker correlation between n(H) and IUV in Magellanic Clouds than the Galactic sight lines. We also obtained N(H)/E(B − V) ratios from the Spitzer-SAGE and previous CO J = 1 − 0 / Hi 21 cm surveys at sight line locations, using dust modeling and standard line brightness-column density conversion factors. They show a roughly linear correlation with absorption-based N(H)/E(B − V) values, and have a similar scatter (∼0.7 dex) across the LMC and SMC.

Keywords

galaxies: ISM — Magellanic Clouds — ISM: abundances — ultraviolet: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S292: Molecular Gas, Dust, and Star Formation in Galaxies , August 2012 , pp. 255
Copyright
Copyright © International Astronomical Union 2013

References

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