Abstract
The 18-cm distribution of OH in the Galactic Center region near Sgr A has been mapped in all four of the 1612, 1665, 1667 and 1720 MHz OH absorption lines using the VLA with 4 arcsec angular resolution and 9 kms-1 velocity resolution. The OH gas at +50 and +20 kms-1 is seen clearly in absorption against the shell structure of Sgr A East but not against the spiral structure of Sgr A West, possibly implying that this molecular gas lies between the two continuum components — behind Sgr A West and in front of Sgr A East. Inside the Circumnuclear Disk, there is a new neutral streamer which sweeps from the disk in towards Sgr A* as the observed radial velocity decreases from +78 to +16 kms-1. The streamer may have a negative-velocity counterpart on the opposite side of Sgr A*.
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© 1989 IAU
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Sandqvist, A., Karlsson, R., Whiteoak, J.B. (1989). OH in the Environment of Sgr A. In: Morris, M. (eds) The Center of the Galaxy. International Astronomical Union Union Astronomique Internationale, vol 136. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2362-1_57
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DOI: https://doi.org/10.1007/978-94-009-2362-1_57
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-0222-3
Online ISBN: 978-94-009-2362-1
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