Observations of NH3 and H2O in the Pelican Nebula hotspot

Details Observations of NH3 and H2O in the Pelican Nebula hotspot Observations of NH3 and H2O in the Pelican Nebula hotspot

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.203.1099w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 203, June 1983, p. 1099-1106. NSF-supported research.

Other

3

Ammonia, Electron Transitions, Molecular Clouds, Nebulae, Water Masers, Astronomical Maps, Brightness Temperature, Emission Spectra, Interstellar Gas, Stellar Evolution

Scientific paper

Observations of NH3 and H2O in the direction of the Pelican Nebula hotspot are presented. Observations of the (J, K) = (1, 1) and (2, 2) transitions of NH3 have resolved the cloud into two condensations, each of about 1.2 pc in size. The line velocities vary by about 2 km/sec over the region, although no obvious systematic gradients which would indicate that the cloud is rotating, collapsing or expanding are found. Instead, these velocity differences are interpreted as due to two spatially separated clouds which lie close to one another. An H2O maser was found in the more intense of these peaks which is apparently not associated with any near-infrared emission. The ammonia observations were used to derive rotation temperatures of about 12 K, densities of 500-2500/cu cm and a cloud mass of about 90 solar masses.

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