Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323..529w&link_type=abstract
Astronomy and Astrophysics, v.323, p.529-533
Astronomy and Astrophysics
Astrophysics
10
Ism: Individual Objects: M8, Ism: Molecules, Radio Lines: Ism
Scientific paper
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 ~31Msun_ molecular core has dimensions ~0.2x0.3pc 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 H_2_ 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 HeI, H_2_, and H^+^ (Brγ) lines and archival HST emission-line images in Hα, [OIII], 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 H36. However, there are variations in the He I/Brγ line ratio which are difficult to explain.
Huldtgren M.
Matthews Henry E.
McCaughrean Mark J.
McCutcheon William H.
Tothill Nick F. H.
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