The galactic center - Structure and kinematics from 21-cm line measurements

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Centimeter Waves, Galactic Nuclei, Galactic Rotation, Galactic Structure, H Lines, Milky Way Galaxy, Absorption Spectra, Emission Spectra, Gas Expansion, Kinematics, Molecular Clouds, Radial Velocity, Spectral Energy Distribution

Scientific paper

The major features dominating the neutral hydrogen emission in a data cube are investigated with regard to their kinematics and position in space. Absorption spectra were determined for a contiguous field defined by l approximately -0.60 to 0.75 deg and b -0.15 to 0.0 deg. A Gaussian analysis for the region between Sgr A and Sgr B2 shows high absorption line continuity. All features show galactic rotation and expansion velocity. The nuclear disk and the gas outside it is inclined to the galactic plane, but a molecular cloud connecting Sgr AE and Sgr B2 shows a warp such that the central parts of the nuclear disk and the molecular ring lie in the galactic plane. The galactic center and the extended thermal component E1 is surrounded by an eccentric expanding molecular ring whose expansion velocity is greater than 100 km/sec.

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