H I absorption measurements over the Galactic center Radio Arc region

Details H I absorption measurements over the Galactic center Radio Arc region H I absorption measurements over the Galactic center Radio Arc region

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..177l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 177-200.

Astronomy and Astrophysics

Astronomy

23

Absorption Spectra, Galactic Nuclei, Galactic Structure, H I Regions, Milky Way Galaxy, Radio Astronomy, Background Radiation, Molecular Clouds, Radio Sources (Astronomy), Very Large Array (Vla)

Scientific paper

The compact array of the VLA was used to study H I absorption in a 100-pc region in the center of the Galaxy. An absence of gas was observed at 40-50 km/s across the Radio Arc, suggesting that the '40 km/s molecular cloud' possibly associated with Sgr A is placed behind the Arc. At +20 km/s, the observations show absorption by material which could be depolarizing much of the synchrotron emission from the Arc filaments. The kinematic structure revealed by high-resolution molecular and radio recombination line observations is confirmed by the distribution of H I gas at -10 to -60 km/s.

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