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Publications of the Astronomical Society of Australia Publications of the Astronomical Society of Australia Society
Publications of the Astronomical Society of Australia
RESEARCH ARTICLE

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


Publications of the Astronomical Society of Australia 19(2) 260 - 264
Published: 30 August 2002

Abstract

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: ISM — Hii regions — ISM: individual ( M8) — ISM: molecules — molecular processes — shock waves — stars: formation

https://doi.org/10.1071/AS02001

© ASA 2002

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