Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282l..93h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 282, July 15, 1984, p. L93-L96.
Astronomy and Astrophysics
Astrophysics
27
Absorption Spectra, Ammonia, Interstellar Matter, Molecular Absorption, Molecular Clouds, Astronomical Maps, H Ii Regions, Line Spectra, Spectral Line Width
Scientific paper
Absorption from the (3, 3) line of NH3 has been detected at -60.0 km s-1 toward the ultracompact H II region IRS 1 in NGC 7538 with the VLA. In single-dish spectra, the line is blended with an emission component at -56.5 km s-1. With the 2arcsec.5×2arcsec.2 beam, however, line emission is resolved. This corresponds to a spatial extent of more than 10arcsec. The molecular cloud covers at least 60% of the continuum source; this is approximately 1arcsec, corresponding to 0.017 pc. From the line shape, the cloud may consist of several clumps of size less than 0.01 pc, each with a different radial velocity and smaller line width. In addition to the spectral line measurements, a 23.87 GHz continuum map of IRS 1, 2, 3 is presented.
Henkel Carsten
Johnston Ken J.
Wilson Thomas L.
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