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    National Tsing Hua University Institutional Repository > 歷任校長 > 徐遐生 (2002-2006) > 期刊論文 >  DENSITY WAVE THEORY AND CLASSIFICATION OF SPIRAL GALAXIES


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81030


    Title: DENSITY WAVE THEORY AND CLASSIFICATION OF SPIRAL GALAXIES
    Authors: ROBERTS, W.W., Jr.;ROBERTS, M.S.;SHU, F.H.
    教師: 徐遐生
    Date: 1975
    Publisher: American Astronomical Society
    Relation: ASTROPHYSICAL JOURNAL, American Astronomical Society, Volume 196, Issue 2, 1975, Pages 381-397
    Keywords: ASTRONOMICAL MODELS
    CLASSIFICATIONS
    GALACTIC STRUCTURE
    SPIRAL GALAXIES
    ANGULAR VELOCITY
    ASTRONOMICAL CATALOGS
    GALACTIC NUCLEI
    MASS DISTRIBUTION
    SHOCK WAVES
    STELLAR EVOLUTION
    STELLAR LUMINOSITY
    STELLAR MASS
    Abstract: Axisymmetric models of disk galaxies taken together with the density wave theory allow one to distinguish and categorize spiral galaxies by means of two fundamental galactic parameters: the total mass of the galaxy, divided by a characteristic dimension, and the degree of concentration of mass toward the galactic center. These two parameters govern the strength of the galactic shocks in the interstellar gas and the geometry of the spiral wave pattern. In turn, the shock strength and the theoretical pitch angle of the spiral arms play a major role in determining the degree of development of spiral structure in a galaxy and its Hubble type. The application of these results to 24 external galaxies demonstrates that the categorization of galaxies according to this theoretical framework correlates well with the accepted classification of these galaxies within the observed sequences of luminosity class and Hubble type.
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    Relation Link: http://aas.org/
    URI: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/81030
    Appears in Collections:[ 徐遐生 (2002-2006)] 期刊論文
    [物理系] 期刊論文

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