Absorption by halo gas in the direction of M13

Details Absorption by halo gas in the direction of M13 Absorption by halo gas in the direction of M13

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..210d&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 210-215.

Astronomy and Astrophysics

Astronomy

63

Absorption Spectra, Galactic Structure, Globular Clusters, Halos, Interstellar Gas, Centimeter Waves, Milky Way Galaxy, Rotating Fluids, Spaceborne Astronomy, Ultraviolet Astronomy

Scientific paper

A high velocity cloud in the direction 1 = 59 degrees, b = 41 degrees is detected in absorption at approximately -80 km/s in high dispersion IUE spectra of the blue star Barnard 29 in the globular cluster M13. The cloud is also seen in the H I 21 cm emission data of Kerr and Knapp (1972). Its radial velocity agrees with Giovanelli's data (1980, 1981) for high velocity clouds seen in this general direction of the sky. The cloud's motion is incompatible with the suggestions that neutral halo gas corotates with disk gas. The motion could be explained if neutral halo gas rotates more slowly than disk gas with increasing distance from the galactic plane. Because of our very limited understanding of the actual motions of halo gas, the scale height of this gas is best derived from plots of N sin b versus z for galactic and extragalactic stars.

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