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    National Tsing Hua University Institutional Repository > 歷任校長 > 徐遐生 (2002-2006) > 期刊論文 >  ON SPIRAL STRUCTURE OF DISK GALAXIES .3. COMPARISON WITH OBSERVATIONS

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81042

    Authors: LIN, C.C.;YUAN, C.;SHU, F.H.
    教師: 徐遐生
    Date: 1969
    Publisher: American Astronomical Society
    Relation: ASTROPHYSICAL JOURNAL, American Astronomical Society, Volume 155, Issue 3P1, 1969, Pages 721-746
    Keywords: DISK GALAXIES
    Abstract: The density-wave theory of galactic spirals is developed in a form slightly more general than that outlined by Lin and Shu in an earlier short communication. Only self-sustained waves are studied in this paper, and the problem of the origin of the spiral structure is barely discussed. The implications of the theory are examined, both in general terms and in detail. The conclusions are compared with observations. Specifically, we consider (1) the distribution of atomic hydrogen in the Galaxy, (2) the systematic motion of the gas, (3) the distribution of young stars and other optical objects, and (4) the migration of moderately young stars. Good agreements are obtained in all cases if we adopt a pattern speed of about 13 km sec-1 kpc-1, and a spiral gravitational field equal to about 5 per cent of the symmetrical field. General discussions are also given on (a) the structure of the magnetic field and its role on the systematic motion of the gas, (b) the role of the density wave in the process of star formation, and (c) the distribution of H II regions as revealed by the 109a radio observations.
    Relation Link: http://aas.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81042
    Appears in Collections:[ 徐遐生 (2002-2006)] 期刊論文
    [物理系] 期刊論文

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