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Intense molecular emission from the Lagoon nebula, M8

White, Glenn J. ; Tothill, N. F. H.; Matthews, H. E.; McCutcheon, W. H.; Huldtgren, M. and McCaughrean, Mark J. (1997). Intense molecular emission from the Lagoon nebula, M8. Astronomy & Astrophysics, 323(2) pp. 529–533.

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Abstract

The discovery is reported of the second strongest source of mm and submm wavelength CO line emission, towards M8, the Lagoon Nebula in Sagittarius. The ~31 M molecular core has dimensions ~0.2 x 0.3pc and is centred on the O7V star Herschel 36 (H36), near the Hourglass Nebula in the core of M8. Emission from the CO line wings extends to the north and south of the Hourglass, although a lack of near-IR H2 emission indicates that outflow activity is much less prominent than in many active star-formation regions, and suggests that the CO line wings may trace the expanding edge of a cavity around H36. The molecular line data are compared with new near-IR narrow-band, continuum-subtracted images in He I, H2, and H,+ (Brγ) lines and archival HST emission-line images in Hα, [O III], and [S II]. The optical and near-IR data are found to be broadly consistent with previous photo-ionisation models of the Hourglass, which is excited by H 36. However, there are variations in the He I/Brγ line ratio which are difficult to explain.

Item Type: Journal Article
ISSN: 1432-0746
Keywords: molecules; radio lines
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 32687
Depositing User: Glenn White
Date Deposited: 13 Mar 2012 16:52
Last Modified: 15 Oct 2014 21:12
URI: http://oro.open.ac.uk/id/eprint/32687
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