Galactic center molecular clouds. II - Distribution and kinematics

Details Galactic center molecular clouds. II - Distribution and kinematics Galactic center molecular clouds. II - Distribution and kinematics

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324..223b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 1, 1988, p. 223-247.

Astronomy and Astrophysics

Astrophysics

224

Galactic Nuclei, Kinematics, Mass Distribution, Milky Way Galaxy, Molecular Clouds, Astronomical Maps, Astronomical Spectroscopy, Gas Dynamics, Line Spectra, Millimeter Waves

Scientific paper

This is a study of the kinematics and distribution of molecular gas near the Galactic center, observed in a variety of millimeter-wave spectral lines. The molecular component is asymmetric with respect to the dynamical center of the Galaxy; about three-fourths of the 13CO and CS emission is produced at positive longitudes and a different three-fourths of the gas is at positive velocities with respect to vLSR = 0 km s-1. The velocity field of the gas is highly chaotic, with some clouds having large (>100 km s-1) departures from the velocity pattern expected from purely circular orbits; however, most of the gas (70%) lies in a thin sheet in the Galactic plane. The rotation curve of the gas varies from vrot ≈ 200 km s-1 at l = 5° to no less than vrot ≈ 120 km s-1 near l = 0°. Simple models of the mass distribution within the inner Galaxy are used to compare the observed scale height of the gas with the predicted scale height as a function of galactocentric radius.

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