| タイトル | Highly blueshifted H I gas toward the Galactic center |
| 著者（英） | Lasenby, Anthony; Yusef-Zadeh, Farhad; Marshall, Jennifer |
| 著者所属（英） | NASA Headquarters |
| 発行日 | 1993-06-10 |
| 言語 | eng |
| 内容記述 | Gusten 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. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A41013 |
| 権利 | Copyright |
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