Galactic spiral structure parameters - Error estimates by numerical experiments

Details Galactic spiral structure parameters - Error estimates by numerical experiments Galactic spiral structure parameters - Error estimates by numerical experiments

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980azh....57..280p&link_type=abstract

(Astronomicheskii Zhurnal, vol. 57, Mar.-Apr. 1980, p. 280-286.) Soviet Astronomy, vol. 24, Mar.-Apr. 1980, p. 164-168. Translat

Astronomy and Astrophysics

Astronomy

10

Error Analysis, Galactic Structure, Milky Way Galaxy, Spiral Galaxies, Accuracy, Bias, Cepheid Variables, Radial Velocity, Velocity Distribution

Scientific paper

The errors and biases in the galactic spiral-structure parameters estimated from the radial-velocity field of 192 Cepheids are determined by means of numerical experiments. The biases result mainly from the peculiar-velocity dispersion, as well as from errors in the distance moduli and radial velocities. The chief factor affecting the chances of identifying spiral structure from radial-velocity data for Cepheids and supergiants is the accuracy of the distance moduli, and the Cepheid distances now available are quite accurate enough to reveal spiral structure.

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