1974 •
Kinematics of Molecules at the Galactic Centre
Authors:
B. J. Robinson
Abstract:
Dense gas clouds containing OH, CO, NH3 and H2CO are found in the inner part of the Hi nuclear disk. The molecular spectral lines allow direct observations of the kinematics of the gas near the galactic centre. Strong absorption of the thermal continuum sources by OH and H2CO shows that much of the gas on the near side of the centre can be located in a massive ‘ring’ expanding at 130 km s -1 which may have originated close to the nucleus about 106 yr ago. Observations of CO emission from beyond the centre show that the far side of the ‘ri (...)
Dense gas clouds containing OH, CO, NH3 and H2CO are found in the inner part of the Hi nuclear disk. The molecular spectral lines allow direct observations of the kinematics of the gas near the galactic centre. Strong absorption of the thermal continuum sources by OH and H2CO shows that much of the gas on the near side of the centre can be located in a massive ‘ring’ expanding at 130 km s -1 which may have originated close to the nucleus about 106 yr ago. Observations of CO emission from beyond the centre show that the far side of the ‘ring’ is expanding at a lower velocity, less than 90 km s-1. Observations of CO and NH3 emission with positive velocities for l< 360° are needed to establish whether the ‘ring’ is a continuous structure. (Read More)
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