
%0 Journal Article
%A Burton, Michael G. 
%T Molecular Hydrogen in the Lagoon: H<emph type="8">2</emph> Line Emission from Messier 8
%J Publications of the Astronomical Society of Australia
%D 2002/06/28
%V 19
%N 2
%P 260-264
%K infrared: ISM &#8212; Hii regions &#8212; ISM: individual &#40;M8&#41; &#8212; ISM: molecules &#8212; molecular processes &#8212; shock waves &#8212; stars: formation
%R https://doi.org/10.1071/AS02001
%U https://www.publish.csiro.au/paper/AS02001 
%X The 2.12 &#956;m v = 1&#8722;0 S&#40;1&#41; 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&#8722;0 S&#40;1&#41; line intensity is 8.2 &#215; 10&#8722;15 erg s&#8722;1 cm&#8722;2arcsec&#8722;2. The line centre emission velocity varies from &#8722;25 kms&#8722;1 in the SE lobe to +45 kms&#8722;1 in the NW lobe. The distribution is similar to that of the CO J = 3&#8722;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 &#126;16 L&odot; and the mass of the hot molecular gas &#126;9 &#215; 10&#8722;4 M&odot; &#40;without any correction for extinction&#41;. 
