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We present [Ci] and [Cii] observations of a linear edge region in the Taurusmolecular cloud, and model this region as a cylindrically symmetric PDR exposedto a low-intensity UV radiation field. The sharp, long profile of the linearedge makes it an ideal case to test PDR models and determine cloud parameters.We compare observations of the [C i], 3P1 -> 3P0 (492 GHz), [C i] 3P2 -> 3P1(809 GHz), and [Cii] 2P3/2 -> 2P1/2 (1900 GHz) transitions, as well as thelowest rotational transitions of 12CO and 13CO, with line intensities producedby the RATRAN radiative transfer code from the results of the Meudon PDR code.We constrain the density structure of the cloud by fitting a cylindricaldensity function to visual extinction data. We study the effects of variationof the FUV field, 12C/13C isotopic abundance ratio, sulfur depletion, cosmicray ionization rate, and inclination of the filament relative to the sky-planeon the chemical network of the PDR model and resulting line emission. We alsoconsider the role of suprathermal chemistry and density inhomogeneities. Wefind good agreement between the model and observations, and that the integratedline intensities can be explained by a PDR model with an external FUV field of0.05 G0, a low ratio of 12C to 13C ~ 43, a highly depleted sulfur abundance (bya factor of at least 50), a cosmic ray ionization rate (3 - 6) x 10-17 s^-1,and without significant effects from inclination, clumping or suprathermalchemistry.

Photon-Dominated Region Modeling of the [C I],[C II], and CO Line Emission from a Boundary in the Taurus Molecular Cloud