Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rmxaa...6..259p&link_type=abstract
(International Astronomical Union, Reunion Regional Latinoamericana de Astronomia, 2nd, Merida, Venezuela, Jan. 19-23, 1981) Rev
Astronomy and Astrophysics
Astronomy
2
Galactic Structure, Milky Way Galaxy, Neutral Gases, Astronomical Maps, Density Wave Model, H Ii Regions, Radial Velocity
Scientific paper
Lindblad (1967) has performed a Gaussian analysis of 21-cm line profiles, taking into account the direction of the galactic anticenter. One of the features considered had an unusually small velocity dispersion of 2.5 km/s and a very wide latitude distribution. Lindblad could explain the entire velocity curve with the aid of a single model. He suggested that this feature, called feature 'A', constitutes a local expanding cloud with an expansion age of some 60 million years. The present investigation is concerned with results regarding three regions. Region I contains the Lupus Loop SNR and parts of the Upper Centaurus-Lupus Association. The rest of this association, as well as parts of the Lower Centaurus-Crux Association, are within region II. Region III includes parts of the Upper Scorpius Association, as well as parts of S27, the remarkable H II region surrounding Zeta Oph. Gas motions were studied by conducting a Gaussian analysis of the H I profiles.
Cappa de Nicolau C. E.
Olano Carlos A.
Poeppel W. G.
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