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The 18 cm OH distribution in the Galactic Center Torus
Stockholm University, Faculty of Science, Department of Astronomy. (Galaxer och kosmologi)
1987 (English)In: / [ed] D. C. Backer, New York: American Institute of Physics (AIP), 1987, 95-95 p.Conference paper, Poster (Other academic)
Abstract [en]

The 18‐cm OH distribution in the Galactic Center region near Sgr A has been studied in all four of the 1612, 1665, 1667 and 1720 MHz OH lines using the VLA with 4 arcsec angular resolution and 9 km s 1 velocity resolution. Three 1667 MHz OH spectral line absorption maps, at +51, +25 and −1 km s 1, covering a 4’.3×4’.3 region around Sgr A are presented together with an 18‐cm continuum map. In addition, a complete set of velocity maps from +139 to −159 km s 1, covering a 3’×3’ region around the Galactic Center nuclear torus, is presented. Absorption by the +50 and +20 km s 1 molecular cloud belt is seen towards Sgr A East, but not towards Sgr A West. Absorption is also seen towards Sgr A* in the velocity ranges of +43 to −36 km s 1 and −142 to −151 km s 1. The Northeast and Southwest torus components can be traced out to velocities of +139 and −151 km s 1. A ‘‘Northwest’’ feature, starting northwest of the Western continuum arc, appears faintly at a velocity of +51 km s 1 and then migrates slightly southward until it merges with another feature at a velocity of +78 km s 1. This other feature ‘‘Sweeps’’ in towards Sgr A* as the velocity decreases from +78 to +16 km s 1.

Place, publisher, year, edition, pages
New York: American Institute of Physics (AIP), 1987. 95-95 p.
National Category
Astronomy, Astrophysics and Cosmology
Research subject
URN: urn:nbn:se:su:diva-122691DOI: 10.1063/1.36408OAI: diva2:868123
AIP Conference Proceedings 155, Berkeley, CA, USA
Available from: 2015-11-09 Created: 2015-11-09 Last updated: 2015-11-09

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Karlsson, Roland
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