Observations of High Velocity Gas in the Galactic Halo

Details Observations of High Velocity Gas in the Galactic Halo Observations of High Velocity Gas in the Galactic Halo

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995iraj...22...36l&link_type=abstract

Irish Astronomical Journal, 1995, 22(1), 36

Astronomy and Astrophysics

Astronomy

Scientific paper

High resolution optical and stellar interstellar observations towards the halo star HD 203664 and 6 surrounding early-type stars have been combined with a 21 cm mapping of the region to investigate a 70 km/s high velocity cloud (HVC). The distance of the HVC from the galactic plane (z) has been constrained to lie between 200 pc and 1500 pc, upper limits to temperature and velocity dispersion of 4600 K and 2.2 km/s have been estimated, and a column density ratio of N(Na I)/n(Ca II) = 0.32 has been deduced. These parameters are consistent with the material being shocked gas, possibly arising from an old supernova remnant. The N(Na I)/N(H I) and N(Ca II)/N(H I) ratios are anomalously large by factors of approximately 20 and 110 respectively, with respect to normal diffuse gas.

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