Thermal and nonthermal motions in dense cores

Details Thermal and nonthermal motions in dense cores Thermal and nonthermal motions in dense cores

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372l..95m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 372, May 10, 1991, p. L95-L98.

Astronomy and Astrophysics

Astronomy

59

Ammonia, Interstellar Magnetic Fields, Spectral Line Width, Star Formation, Stellar Cores, Stellar Mass, Infrared Astronomy Satellite, Stellar Luminosity

Scientific paper

Kinetic temperature and NH3 line width data for 61 dense cores with embedded IRAS sources show that the nonthermal component of the core motions increases with source luminosity more rapidly than does the thermal component. The trends cross in the luminosity range 7-22 solar luminosities, which divides the regimes of thermal and nonthermal motions. Maps of line widths in dense cores and their surrounding clouds indicate that nonthermal line broadening is due not only to stellar winds, but also to gas properties independent of the star. The 'initial conditions' for motions in cores forming lower-mass stars are primarily thermal, while those in cores forming higher mass stars are probably primarily nonthermal. These differences in core properties may arise from differences in the relative proportion of magnetic and gravitational energy in the condensing core.

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