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- W3104703048 abstract "There is now strong evidence suggesting that the 12CO J = 1-0 transition, widely used to trace H2 gas, significantly underestimates its mass in metal-poor regions. In spiral disks such regions are found in large galactocentric distances where we show that any unaccounted H2 gas phase is likely to be diffuse (~5-20 cm^-3) and warmer (T(kin) ~ 50-100 K) than the cool (T(kin) ~ 15-20 K) CO-luminous one. Moreover we find that a high value of the H2 formation rate on grains, suggested by recent observational work, can compensate for the reduction of the available grain surface in the metal-poor part of typical galactic disks and thus enhance this CO-poor H2 component which may be contributing significantly to the mass and pressure of spiral disks beyond their optical radius." @default.
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- W3104703048 date "2002-11-01" @default.
- W3104703048 modified "2023-10-16" @default.
- W3104703048 title "Molecular Gas in Spiral Galaxies: A New Warm Phase at Large Galactocentric Distances?" @default.
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- W3104703048 doi "https://doi.org/10.1086/342872" @default.
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