Other
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aipc..155...95s&link_type=abstract
AIP Conference Proceedings, Volume 155, pp. 95-98 (1987).
Other
11
Scientific paper
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.
Gardner Frank F.
Karlsson Roland
Sandqvist Aage
Whiteoak John B.
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