The kinematics of Milky Way halo gas. I - Observations of low-ionization species

Details The kinematics of Milky Way halo gas. I - Observations of low-ionization species The kinematics of Milky Way halo gas. I - Observations of low-ionization species

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..785d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 785-806.

Astronomy and Astrophysics

Astrophysics

96

H I Regions, Halos, Interstellar Gas, Milky Way Galaxy, Astrometry, Distance, Gas Ionization, Iue, Ultraviolet Spectra

Scientific paper

Ultraviolet interstellar line day observed with the IUE toward 70 halo stars and four extragalactic sight lines are analyzed in a study of the large-scale kinematic properties of the Milky Way halo gas. The motions of the low-ionization gas is focused on. Large systematic velocities are found, and a pronounced asymmetry in the absorption characteristics of halo gas toward the Galactic poles is indicated. In the north, substantial amounts of material are falling toward the disk at velocities up to about 120 km/s in the most extreme case. Toward the south, low-ionization material shows no extreme or systematic motions.

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