Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.2218z&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #22.18; Bulletin of the American Astronomical Society, Vol. 26, p.1349
Astronomy and Astrophysics
Astronomy
Scientific paper
The high-negative-velocity cloud at --180 km s(-1) was discussed by Gusten & Downes (1981) more than a decade ago. Since then, numerous observations were carried out to determine the properties of this component; however the nature of this feature was uncertain due to the lack of high angular resolution observations. Recently we have carried out VLA observations of this feature in the 1667 MHz line of OH at V_LSR=--180 km s(-1) with an angular resolution of several arc seconds. Both the structure and the kinematics have been determined and we show that the high-negative-velocity absorbing gas is well mixed with the ionized gas in the center of the Galaxy. The observed kinematics are not consistent with ejection, outflow, or a possible association with the expanding molecular ring at V_LSR=--135 km s(-1) . The mass of neutral gas seen in absorption at --180 km s(-1) is about 5times 10(3) M_sun, only a small fraction of the entire cloud observed in CO emission. Based on a numerical model, we demonstrate that the high velocity gas flows towards the Galactic center and interacts with the central gravitational potential which can distort the kinematics of the high velocity gas projected in front of Sgr A West.
Goss William Miller
Ho Pak Tung
Zhao Jian-Hong
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