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Highly blueshifted H I gas toward the Galactic centerGusten and Downes (1981) discovered the presence of -190 km/s absorbing H I gas toward the Galactic center. Using the VLA in its most compact hybrid configuration, we were able to image the distribution of this high-negative-velocity H I spectral feature with a spatial and spectral resolution of about 25 arcsec and 6.2 km/s, respectively. The blueshifted H I gas is dominated by systematic radial motion as great as -210 km/s and is localized to within several arcmin of the dynamical center of the Galaxy. We show a striking column of diffuse H I gas extending for several arcmin in the direction along the rotation axis of the molecular disk encircling the Galactic center. The H I optical depth distribution indicates that a total of about 3000 solar masses of neutral material, with -211 to -160 km/sec velocity, appears to be associated with this feature. This unusual kinematic feature appears to coexist with two systems of rotationally supported ionized (Sgr A West) and molecular (circumnuclear disk) gas.
Document ID
19930057016
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Yusef-Zadeh, Farhad
(Northwestern Univ. Evanston, IL, United States)
Lasenby, Anthony
(NASA Headquarters Washington, DC United States)
Marshall, Jennifer
(Mullard Radio Astronomy Observatory Cambridge, United Kingdom)
Date Acquired
August 16, 2013
Publication Date
June 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 410
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A41013
Funding Number(s)
CONTRACT_GRANT: NAGW-2518
CONTRACT_GRANT: NSF AST-90-23372
Distribution Limits
Public
Copyright
Other

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