Volume 403, Number 3, June I 2003
|Page(s)||1011 - 1021|
|Section||Interstellar and circumstellar matter|
|Published online||23 May 2003|
18-cm VLA observations of OH towards the Galactic Centre*
Absorption and emission in the four ground-state OH lines
Stockholm Observatory, SCFAB-AlbaNova, 106 91 Stockholm, Sweden e-mail: email@example.com
2 Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands
3 NRAO Array Operations Center, PO Box 0, Socorro NM 87801, USA e-mail: firstname.lastname@example.org
4 CSIRO, Australian Telescope National Facility, Box 76, Epping NSW 2121, Australia e-mail: email@example.com
Corresponding author: Aa. Sandqvist, firstname.lastname@example.org
Accepted: 28 February 2003
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 . Some clear results are highlighted here, such as absorption from the Circumnuclear Disk (CND) and the OH-Streamer inside the CND near Sgr , 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 , 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.
Key words: Galaxy: center / ISM: individual objects: Sgr A / ISM: molecules / ISM: clouds / masers / surveys
© ESO, 2003
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