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Molecular gas in spiral galaxies: a new warm phase at large galactocentric distances? | | P. P. Papadopoulos
; W.-F. Thi
; S. Viti
; | | Date: |
29 Aug 2002 | | Journal: | Astrophys.J. 579 (2002) 270-274; Erratum-ibid. 583 (2003) 524 | | Subject: | astro-ph | | Affiliation: | ESA/Estec), W.-F. Thi (UCL) and S. Viti (UCL | | 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. | | Source: | arXiv, astro-ph/0208535 | | Services: | Forum | Review | PDF | Favorites | |
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