An imbalance in the Local Galactic halo?

Details An imbalance in the Local Galactic halo? An imbalance in the Local Galactic halo?

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1445c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, June 1987, p. 1445-1453.

Mathematics

Probability

7

Celestial Mechanics, Galactic Evolution, Halos, Milky Way Galaxy, Stellar Motions, Astronomical Coordinates, Metallicity, Radial Velocity, Velocity Distribution

Scientific paper

In a kinematically biased sample of 119 single halo stars, 65 percent of the stars are traveling away from the plane of the Galaxy. Halo spectroscopic binaries do not show this imbalance. Other kinematically biased halo surveys exhibit the same effect. Combining these samples with those of the authors' results in 223 halo stars, 63 percent of which are heading away from the plane of the Galaxy. The probability that the first result could be obtained from a symmetric w velocity distribution is 0.2 percent; the probability that the second result could be so obtained is 0.02 percent. Single halo stars traveling away from the disk appear to have a larger w velocity dispersion than those traveling toward it. Selection effects are analyzed and rejected as the cause of the observed asymmetry. Possible mechanisms for producing the imbalance are discussed, but each has serious difficulties accounting for the observations.

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