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Date and Time of the Query: 2019-06-19 T19:52:29 PDT
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For refcode 2006A&A...451..917R:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2006A&A...451..917R [CII] 158 microns emission and metallicity in photon dominated regions M. Rollig, V. Ossenkopf, S. Jeyakumar, J. Stutzki and A. Sternberg Received 18 July 2005 / Accepted 14 November 2005 We study the effects of a metallicity variation on the thermal balance and [CII] fine-structure line strengths in interstellar photon dominated regions (PDRs). We find that a reduction in the dust-to-gas ratio and the abundance of heavy elements in the gas phase changes the heat balance of the gas in PDRs. The surface temperature of PDRs decreases as the metallicity decreases except for high density (n>10^6^ cm^-3^) clouds exposed to weak ({chi}< 100) FUV fields where vibrational H_2_-deexcitation heating dominates over photoelectric heating of the gas. We incorporate the metallicity dependence in our KOSMA-{tau} PDR model to study the metallicity dependence of [CII]/CO line ratios in low metallicity galaxies. We find that the main trend in the variation of the observed CII/CO ratio with metallicity is well reproduced by a single spherical clump, and does not necessarily require an ensemble of clumps as in the semi-analytical model presented by Bolatto et al. (1999). Key words: ISM: abundances, ISM: structure, ISM: clouds, ISM: general, galaxies: ISM, galaxies: abundances
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