NH3 observations of the GGD 12-15 and NGC 7129 dense cloud cores

Details NH3 observations of the GGD 12-15 and NGC 7129 dense cloud cores NH3 observations of the GGD 12-15 and NGC 7129 dense cloud cores

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...164..342g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 164, no. 2, Aug. 1986, p. 342-348.

Astronomy and Astrophysics

Astrophysics

25

Ammonia, Molecular Clouds, Star Formation, Astronomical Maps, Early Stars, Infrared Stars, Masers, Reflection Nebulae

Scientific paper

High-resolution ammonia maps of the dense molecular cloud cores GGD 12-15 and NGC 7129 are presented. For both clouds kinetic temperatures of about 20-30 K are inferred from the intensity ratio between the NH3 (J, K) = (1,1) and (2,2) inversion lines. As in other sites of massive star formation, these temperatures significantly exceed those found in dark clouds without local heat sources. While the velocity field across NGC 7129 is rather simple, GGD 12-15 has a complex velocity structure. At least three distinct velocity features are distinguished. The motions appear ordered and may represent another example of a rotating ringlike structure. Masses for these sub-pc-sized dense cores of 10-100 solar mass are estimated.

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