The two-fold disc-wide symmetry of spiral arms is generally attributed to density waves. Densisty wave theory can also explain a modulation of the star formation pattern along the arms according to the radial relation of the site with respect to the density-wave resonances. The degree of two-fold symmetry is reduced by the presence of a bar component. This is attributed to the increased radial mixing as a result of the non-axisymmetric bar structure. In order to quantify the influence of the bar component we selected a sample of spirals with various bar strengths.
机构:
Liverpool John Moores Univ, Astrophys Res Inst, IC2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, EnglandLiverpool John Moores Univ, Astrophys Res Inst, IC2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
James, P. A.
Percival, S. M.
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Liverpool John Moores Univ, Astrophys Res Inst, IC2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, EnglandLiverpool John Moores Univ, Astrophys Res Inst, IC2,Liverpool Sci Pk,146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England
机构:
Max Planck Inst Astron, D-69117 Heidelberg, Germany
Amer Museum Nat Hist, Dept Astrophys, New York, NY 10024 USA
Univ Heidelberg, Zentrum Astron, Inst Theoret Astrophys, D-6900 Heidelberg, GermanyMax Planck Inst Astron, D-69117 Heidelberg, Germany