Observational study of MBM12 shows CO-to-H2 conversion factor near galactic average with density-dependent variations, high virial parameters decreasing at small scales, broken power-law mass-size relations indicating external pressure, and magnetic field orientation transition at N(H2) = 4.5e21 cm-
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Molecular gas in M83 consists of two log-normal density components, with the high-density component enhanced along spiral arms and more tightly linked to star formation than the low-density component.
Dwarf irregular galaxies form stars sequentially in dispersed HI clouds and on expanding cavity rims at ~1% efficiency per free-fall time, comparable to spiral galaxy clouds but without CO due to lower metallicity.
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Pervasive Cavity-Ring Structure for Star Formation in Dwarf Irregular Galaxies
Dwarf irregular galaxies form stars sequentially in dispersed HI clouds and on expanding cavity rims at ~1% efficiency per free-fall time, comparable to spiral galaxy clouds but without CO due to lower metallicity.