Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..830r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 830-836.
Astronomy and Astrophysics
Astrophysics
43
Absorption Spectra, Ammonia, Star Formation, Stellar Envelopes, H Ii Regions, Interstellar Magnetic Fields, Molecular Clouds, Nebulae, Optical Thickness, Radio Spectra
Scientific paper
Observations of absorption in the 1.3 cm (J,K) = (1,1) amd (2,2) lines of NH3 toward the ultracompact H II region W3(OH) made at subarcsecond resolution with the VLA are reported. Maps of optical depth, beam-filling factor, column density, and rotational temperature are presented. The NH3 absorption is similar to the OH maser emission in velocity, extent, and location, a result which suggests that both species are constituents of the same clumpy molecular envelope. The optical depths are nearly constant across the maps, while the beam-filling factors and the (2,2)-(1,1) rotational temperature decrease from west to east. The NH3 maps and the OH maser results indicate that the thermal and turbulent pressures in the ultracompact H II region are comparable to the magnetic and ram pressures from the surrounding neutral material that appears to be falling inward.
Bieging John H.
Myers Philip C.
Reid Mark J.
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