Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..748g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 748-766.
Astronomy and Astrophysics
Astrophysics
13
Interstellar Matter, Milky Way Galaxy, Missing Mass (Astrophysics), Trace Elements, Dark Matter, Galactic Structure, Halos
Scientific paper
The role of high-altitude tracer stars in determining the Galactic disk potential is systematically analyzed. It is shown that typical data sets are sufficient to measure the disk column density to a 1 sigma accuracy of 24 percent. This figure could be improved to 16 percent by a threefold increase in data or to 10 percent by a tenfold increase. These high statistics are necessary because of the large uncertainty in the 'effective halo density' which arises from the large-scale structure of the Galaxy. It is shown that this uncertainty is mainly the result of uncertainties in the solar speed and solar Galactocentric distance. Significant improvement in the measurement of these quantities would be equivalent to about a threefold increase in statistics and would thus greatly enhance the role of high-altitude tracers.
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