Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.222..299g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 222, Sept. 15, 1986, p. 299-306.
Astronomy and Astrophysics
Astronomy
57
Emission Spectra, Hydrogen Clouds, Line Spectra, Milky Way Galaxy, Molecular Gases, Velocity Distribution, Astronomical Maps, Brightness Distribution, Galactic Nuclei, Radial Velocity, Spatial Resolution
Scientific paper
In an earlier paper the authors have demonstrated the existence of a ring of molecular hydrogen-line emission surrounding the nucleus of the Galaxy. Here they present the first detailed maps of the surface brightness and the velocity field, made in the υ =1-0 S(1) line of molecular hydrogen with a spatial resolution of 18 arcsec and a velocity resolution of 130 km s-1. The authors find that the molecular ring is tilted approximately 20° out of the plane of the Galaxy, has a broken and clumpy appearance, rotates at 100 km s-1 in the sense of galactic rotation, and exhibits radial motion at a velocity of 50 km s-1. The authors interpret the radial motion as infall. Their earlier model, in which the molecular ring is created and excited by a single central engine, possibly a black hole, remains viable, and is further supported and refined by the present observations.
Gatley Ian
Geballe Thomas Ronald
Hyland A. R.
Jones Terry J.
Krisciunas Kevin
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