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Cambridge University Press, Publications of the Astronomical Society of Australia, 2(19), p. 260-264, 2002

DOI: 10.1071/as02001

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Molecular Hydrogen in the Lagoon: H2 line emission from Messier 8

Journal article published in 2002 by Michael G. Burton ORCID, Michael Physics Faculty of Science UNSW Burton
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractThe 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).