Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..199w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 1, 1991, p. 199-207.
Astronomy and Astrophysics
Astrophysics
33
Comets, Gas Dynamics, H Ii Regions, Interstellar Gas, Ionized Gases, Nebulae, Astronomical Models, Cosmic Dust, Radial Velocity, Spectral Emission, Spectral Line Width
Scientific paper
The H76-alpha recombination line emission distribution from the cometary UC H II regions G29.96 - 0.02 has been mapped with a resolution of 0.62 x 0.49 arcsec. The distribution of radial velocities in the ionized gas is well ordered. There is an unambiguous velocity gradient across the face of the nebula with velocities ranging from about 80 km/s on the leading edge of the cometary arc to about 105 km/s in the 'tail', a shift of about 25 km/s over an angular distance of about 4 arcsec. The linewidths are significantly broader along the leading edge of the cometary arc than elsewhere in the nebula. LTE electron temperatures are systematically low throughout the nebula, ranging from about 2500 K to 4200 K at different points in the H II region. Non-LTE line models combined with the continuum image imply that the electron densities in the arc are 5-10 times greater than in the tail of the nebula. G29.96 - 0.02 is moderately attenuated by interstellar dust.
Churchwell Edward
Wood Douglas O. S.
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