CI fine-structure emission from non-equilibrium PDRs.

Details CI fine-structure emission from non-equilibrium PDRs. CI fine-structure emission from non-equilibrium PDRs.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...323l..13s&link_type=abstract

Astronomy and Astrophysics, v.323, p.L13-L16

Astronomy and Astrophysics

Astrophysics

14

Line: Formation, Ism: Clouds, Ism: Molecules, Radio Lines: Interstellar

Scientific paper

We present computations of [CI] 609μm and 370μm fine-structure line emission from non-equilibrium clouds which are suddenly shielded from initially intense far-ultraviolet radiation fields. After the incident UV fluxes are diminished the initially abundant C^+^ ions rapidly recombine, and the neutral atomic carbon is then slowly incorporated into CO molecules. The cloud cooling times are longer than the CI formation times, and intense [CI] emission persists as the clouds cool. The [CI] emission is thus much brighter from cooling clouds than in equilibrium photon dominated regions. We argue that if UV-scattering is inefficient the extended [CI] emission observed in star-forming regions may be better explained by non-equilibrium models than by steady state models.

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