摘要: We examine the hypothesis that hydrostatic pressure alone determines ratio of atomic to molecular gas averaged over a particular radius in disk galaxies. The implies transition radius, location where is unity, should always occur at same value stellar surface density all data for 28 galaxies and find indeed constant 40% 120 M_sun/pc^2. If can be confirmed radii within large range galaxy types metallicities, combining it with observed constancy star formation rate H_2 may enable physically motivated prescription wide applicability.
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