Aperture synthesis observations of H I absorption in the galactic centre

Details Aperture synthesis observations of H I absorption in the galactic centre Aperture synthesis observations of H I absorption in the galactic centre

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....54..863s&link_type=abstract

Astronomy and Astrophysics, vol. 54, no. 3, Feb. 1977, p. 863-868.

Astronomy and Astrophysics

Astrophysics

18

Absorption Spectra, Galactic Nuclei, Hydrogen Clouds, Interstellar Matter, Molecular Absorption, Astronomical Maps, Carbon Monoxide, Formaldehyde, Hydroxyl Radicals

Scientific paper

High-resolution aperture synthesis observations of the H I absorption in Sgr A are reported. They show essentially smooth, featureless absorption at negative velocities, and three major features at positive velocities. Two of these, at 30 and 50 km/sec, have been previously observed in absorption studies, while the feature at 70 km/sec has only been noted previously in CO emission. This 70 km/sec feature is located on the northwestern edge of Sgr A West. Several models are discussed in the light of the findings, but the most comprehensive model at present to account for the features of the clouds is one in which an extended complex of gas is streaming at positive velocities through the vicinity of the galactic nucleus, being ionized at the position of Sgr A west.

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