Population studies - Evidence for accretion of the galactic halo

Details Population studies - Evidence for accretion of the galactic halo Population studies - Evidence for accretion of the galactic halo

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336l..17n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. L17-L19.

Astronomy and Astrophysics

Astrophysics

31

Dwarf Stars, Galactic Evolution, Galactic Structure, Milky Way Galaxy, Halos, Stellar Orbits

Scientific paper

While there are comparatively few prograde-orbit dwarf stars in advance of the sun's motion of the type of which 510, selected kinematically, are presented, it is noted that there are significant numbers of objects on retrograde orbits that move with a speed greater than the sun's, relative to a nonrotating system, in the opposite direction about the Galactic center. It is suggested that this asymmetry is explainable in terms of the Searle and Zinn (1978) and Rodgers and Paltoglou (1984) models of halo formation by accretion; in these, fragments experience dynamical friction from an already-formed Galactic disk.

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