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Large column densities and [12CII] 158 μm self-absorption in Orion B

Published online by Cambridge University Press:  21 March 2013

J. Stutzki ,
U. U. Graf ,
R. Simon ,
S. W. J. Colgan ,
X. Guan ,
R. Güsten  and
C. E. Honingh
J. Stutzki
Affiliation:
I. Physikalisches Institut der Universitẗ zu Köln, Zülpicher Straße 77, D50937 Köln, Germany email: stutzki@ph1.uni-koeln.de
U. U. Graf
Affiliation:
I. Physikalisches Institut der Universitẗ zu Köln, Zülpicher Straße 77, D50937 Köln, Germany email: stutzki@ph1.uni-koeln.de
R. Simon
Affiliation:
I. Physikalisches Institut der Universitẗ zu Köln, Zülpicher Straße 77, D50937 Köln, Germany email: stutzki@ph1.uni-koeln.de
S. W. J. Colgan
Affiliation:
NASA Ames Research Center, Moffett Field, CA, USA
X. Guan
Affiliation:
I. Physikalisches Institut der Universitẗ zu Köln, Zülpicher Straße 77, D50937 Köln, Germany email: stutzki@ph1.uni-koeln.de
R. Güsten
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D53121 Bonn, Germany
C. E. Honingh
Affiliation:
I. Physikalisches Institut der Universitẗ zu Köln, Zülpicher Straße 77, D50937 Köln, Germany email: stutzki@ph1.uni-koeln.de
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Abstract

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We present a preliminary analysis of the self-absorbed [CII]-spectra observed with SOFIA/GREAT towards NGC 2024. Together with the detected [13CII] hyperfine satellites, the observed spectra require surprisingly high column densities of C+, both in the warm core and the foreground absorption component. Such high column densities are a challenge to explain with present state-of-the-art PDR models of the UV/molecular cloud interaction.

Keywords

ISM: molecules — ISM: clouds — ISM: individual (Orion B)
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. 57 - 58
Copyright
Copyright © International Astronomical Union 2013

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