Journal Article

The kinetic temperature in a damped Lyman α absorption system in Q2206−199 – an example of the warm neutral medium

R. F. Carswell, G. D. Becker, R. A. Jorgenson, M. T. Murphy and A. M. Wolfe

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 2, pages 1700-1708
Published in print May 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20746.x
The kinetic temperature in a damped Lyman α absorption system in Q2206−199 – an example of the warm neutral medium

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By comparing the widths of absorption lines from O i, Si ii and Fe ii in the redshift zabs= 2.076 single-component damped Lyα system in the spectrum of Q2206−199 we establish that these absorption lines arise in warm neutral medium (WNM) gas at ∼12 000 ± 3000 K. This is consistent with thermal equilibrium model estimates of ∼8000 K for the WNM in galaxies, but not with the presence of a significant cold component. It is also consistent with, but not required by, the absence of C ii fine structure absorption in this system. Some possible implications concerning abundance estimates in narrow-line WNM absorbers are discussed.

Keywords: line: profiles; quasars: absorption lines; quasars: individual: Q2206−199

Journal Article.  7485 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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