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- W2009189685 abstract "We investigate the physical properties of molecular hydrogen (H2) in isolated and interacting disk galaxies with different masses and Hubble types by using chemodynamical simulations with H2 formation on dust grains and dust growth and destruction in interstellar medium (ISM). We particularly focus on the dependences of H2 gas mass fractions (f_H2), spatial distributions of HI and H2, and local H2-scaling relations on initial halo masses (M_h), baryonic fractions (f_bary), gas mass fractions (f_g), and Hubble types. The principal results are as follows. The final f_H2 can be larger in disk galaxies with higher M_h, f_bary, and f_g. Some low-mass disk models with M_h smaller than 10^10 M_sun show extremely low f_H2 and thus no/little star formation, even if initial f_g is quite large (>0.9). Big galactic bulges can severely suppress the formation of H2 from HI on dust grains whereas strong stellar bars can not only enhance f_H2 but also be responsible for the formation of H2-dominated central rings. The projected radial distributions of H2 are significantly more compact than those of HI and the simulated radial profiles of H2-to-HI-ratios (R_mol) follow roughly R^-1.5 in MW-type disk models. Galaxy interaction can significantly increase f_H2 and total H2 mass in disk galaxies. The local surface mass densities of H2 can be correlated with those of dust in a galaxy. The observed correlation between R_mol and gas pressure (R_mol ~ P_g^0.92) can be well reproduced in the simulated disk galaxies." @default.
- W2009189685 created "2016-06-24" @default.
- W2009189685 creator A5073753592 @default.
- W2009189685 date "2014-08-29" @default.
- W2009189685 modified "2023-09-26" @default.
- W2009189685 title "Formation and evolution of molecular hydrogen in disc galaxies with different masses and Hubble types" @default.
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- W2009189685 doi "https://doi.org/10.1093/mnras/stu1493" @default.
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