Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..237l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 237-244.
Astronomy and Astrophysics
Astronomy
40
Galactic Nuclei, Infrared Astronomy, Interstellar Gas, Molecular Clouds, Radio Sources (Astronomy), Carbon Monoxide, H Ii Regions, Morphology, Sagittarius Constellation, Very Large Array (Vla)
Scientific paper
The large-scale radio continuum structure of the Sgr A complex of radio sources is discussed, with reference to recent Very Large Array (VLA) data. It is shown that the large-scale structure follows the borders of the 50 km/s neutral gas cloud. Correspondence between the radio arc feature and the boundary of the cloud suggests that the shape of the arc is determined by neutral material. A strong emission peak in the CO line is coincident with observations of a new cluster of H II regions. Analysis of the small-scale structure of Sgr A(asterisk) and Sgr A (West) shows that the two sources are encircled by a ring of gas which is visible in H I and (C-12)O and has a radius of about 3 pc and a rotation velocity of about 110 km/s. The ring provides H I or H2CO absorption at a velocity of 40-60 km/s in the direction Sgr A (West). The orientation of the ring relative to the galactic equator is illustrated in a series of declination-velocity and ascension-velocity diagrams.
Burton William Butler
Liszt Harvey Steven
van der Hulst J. M.
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