18-cm VLA observations of OH towards the Galactic Centre. Absorption and emission in the four ground-state OH lines

Details 18-cm VLA observations of OH towards the Galactic Centre. Absorption and emission in the four ground-state OH lines 18-cm VLA observations of OH towards the Galactic Centre. Absorption and emission in the four ground-state OH lines

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403.1011k&link_type=abstract

Astronomy and Astrophysics, v.403, p.1011-1021 (2003)

Astronomy and Astrophysics

Astrophysics

16

Galaxy: Center, Ism: Individual Objects: Sgr A, Ism: Molecules, Ism: Clouds, Masers, Surveys

Scientific paper

The OH distribution in the Sgr A Complex has been observed in the 1612-, 1665-, 1667- and 1720-MHz OH transitions with the Very Large Array (VLA) in BnA configuration. Maps are presented with a channel velocity resolution of about 9 km s-1 and with angular resolutions of 4arcsec x 3arcsec . Some clear results are highlighted here, such as absorption from the Circumnuclear Disk (CND) and the OH-Streamer inside the CND near Sgr A*, strong absorption towards most of the eastern and western parts of the Sgr A East shell, lack of absorption towards both Sgr A West and the compact H II-regions to the east of Sgr A East, and double-lobed structure of the High Negative Velocity Gas (HNVG) oriented northeast and southwest of Sgr A*, and finally compact, point-like maser emission in all four transitions, in particular a 1720-MHz maser at -132 km s-1 in the CND as counterpart to a 1720-MHz maser at +132 km s-1 in the CND.
Figures \ref{fig1} to \ref{fig4} are only available in electronic form at
http://www.edpsciences.org

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