Kinematics and density of the Galactic spheroid

Details Kinematics and density of the Galactic spheroid Kinematics and density of the Galactic spheroid

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..347b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 1, 1986, p. 347-356.

Astronomy and Astrophysics

Astrophysics

62

Galactic Rotation, Kinematics, Radial Velocity, Stellar Motions, Astronomical Catalogs, Density (Mass/Volume), Luminosity, Metallicity

Scientific paper

The authors reanalyze Eggen's proper-motion and radial velocity data for a sample of 94 stars with transverse velocities in excess of 220 km s-1, correcting for observational biases and selection effects by a Monte Carlo analysis of simulated catalogs of proper-motion stars. They obtain a local spheroid number density of n = (9.5±1.3)×10-5pc-3 for 4 ≤ MV ≤ 11 mag. The Eggen catalog yields the following kinematic parameters for the spheroid: an asymmetric drift of 154 km s-1 (corresponding to a rotation velocity ≡66 km s-1), and velocity dispersions in the r, θ, and z directions of 140, 100, and 76 km s-1, respectively. All three of the commonly applied definitions of the spheroid (pressure supported, low metallicity, and geometric distribution) yield consistent results for the density of Population II stars in the vicinity of the Sun.

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