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Molecular Hydrogen in the Lagoon: H2 Line Emission from Messier 8

Published online by Cambridge University Press:  05 March 2013

Michael G. Burton
Michael G. Burton*
Affiliation:
School of Physics, University of New South Wales, Sydney, NSW 2052, Australia School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland; [email protected]
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Abstract

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The 2.12 μm v = 1−0 S(1) line of molecular hydrogen has been imaged in the Hourglass region of M8. The line is emitted from a roughly bipolar region, centred around the O7 star Herschel 36. The peak H2 1−0 S(1) line intensity is 8.2 × 10−15 erg s−1 cm−2arcsec−2. The line centre emission velocity varies from −25 kms−1 in the SE lobe to +45 kms−1 in the NW lobe. The distribution is similar to that of the CO J = 3−2 line. The H2 line appears to be shock-excited when a bipolar outflow from Herschel 36 interacts with the ambient molecular cloud. The total luminosity of all H2 lines is estimated to be ˜16 L⊙ and the mass of the hot molecular gas ˜9 × 10−4 M⊙ (without any correction for extinction).

Keywords

infrared: ISMHii regionsISM: individual (M8)ISM: moleculesmolecular processesshock wavesstars: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 19 , Issue 2 , 2002 , pp. 260 - 264
Copyright
Copyright © Astronomical Society of Australia 2002

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