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Paper: The Dense Interstellar Medium in Low and High-Redshift Starbursts: PDR Models
Volume: 375, From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies
Page: 43
Authors: Kaufman, M.J.; Wolfire, M.G.; Hollenbach, D.J.
Abstract: Over the past 20 years, PDR models have developed into mature and useful tools for analyzing emission from dense and diffuse interstellar clouds illuminated by FUV radiation. The classic PDR tracers are the [OI] 63 μm and [CII] 158 μm fine-structure lines, along with the far-infrared continuum. While these tracers are useful for constraining the physical conditions in nearby individual PDRs, care must be used in applying the models to more distant regions, especially extragalactic observations in which both dense star-forming regions and diffuse gas lie in the beam. Recent observations of H2 in nearby galactic nuclei independently probe the dense gas component and provide a calibration for observations where multiple components lie in the beam. These models have also been used to model [CII], CO, and FIR continuum emission from the z = 6.4 quasar SDSS J1148+5251. The implications for ALMA observations of starbursts, particularly of [CII] and [OI] in galaxies with low metallicity at high redshift, are discussed.
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