Ammonia in the W3 region

Details Ammonia in the W3 region Ammonia in the W3 region

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..169z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 169-173.

Astronomy and Astrophysics

Astronomy

14

Abundance, Ammonia, Infrared Radiation, Interstellar Gas, Line Spectra, Stellar Evolution, H Ii Regions, Infrared Astronomy

Scientific paper

Maps of the (J,K) = (1,1) and (2,2) lines of NH3 over the region measured in the 400-micron emission by Jaffe et al. (1983) show that NH3 emission is strongest toward the western 400-micron peak, near IRS4 and the H II region W3C. The rotational temperature there is about 30 K, and the deconvolved angular size of the NH3 region is 57 x 47 arcsec (FWHP). Toward the eastern 400-micron peak, centered on IRS5, the NH3 is hotter with TR of about 50 K. The abundance is one-half of that in the western peak, although in a 43 x 45-arcsec beam, the column density and density of H2 are comparable in the two regions. Considering the uncertainties, the factor of two difference in the (NH3/H2) ratio is not regarded to be very significant. Comparisons with the distribution of other molecules mapped in the core of W3 are made. Between the clouds associated with W3 and W3(OH), there is no detectable NH3, although NH3 is present in an approximately 1-arcmin region around W3(OH) itself.

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