Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984msngr..36...26b&link_type=abstract
ESO Messenger (ISSN 0722-6691), June 1984, p. 26-28.
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Galactic Rotation, Gravitational Fields, Mass Distribution, Nebulae, Galactic Clusters, H Lines, Hydrogen Clouds, Milky Way Galaxy, Stellar Color
Scientific paper
Progress on a project to determine the shape and strength of the gravitational force influencing the motion of material in the Galaxy is discussed. Attention is focused on the 3rd and 4th quadrant, i.e., the outer Galaxy, and the movement of molecular material. The data are gathered by observing H II lines as a tracer to quantify the galactic rotation curve. Photometric measurements are also made of stars located in nebulae which emit lines similar to the H II lines. Unreddened colors are found for the stars, followed by heliocentric distance and thereby the galactocentric distance. Clouds near some of the nebulae have exhibited velocities of up to 77 km/sec and 18 kpc distances from the galactic center. The most distant objects that can be detected are expected to lie at about 20 kpc from the galactic center. Color and luminosity profiles for objects in the 15-20 kpc radii interval have yet to be measured.
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