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OH in the Environment of Sgr A

Published online by Cambridge University Press:  23 September 2016

Aa. Sandqvist ,
R. Karlsson  and
J. B. Whiteoak
Aa. Sandqvist
Affiliation:
Stockholm Observatory S-133 36 Saltsjöbaden, Sweden
R. Karlsson
Affiliation:
Stockholm Observatory S-133 36 Saltsjöbaden, Sweden
J. B. Whiteoak
Affiliation:
CSIRO, P.O. Box 76 Epping, NSW 2121, Australia

Abstract

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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-l 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∗.

Type
Sagittarius A West and the Circumnuclear Disk
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 421 - 422
Copyright
Copyright © Kluwer 1989