Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..375...43k&link_type=abstract
From Z-Machines to ALMA: (Sub)Millimeter Spectroscopy of Galaxies ASP Conference Series, Vol. 375, proceedings of the conference
Astronomy and Astrophysics
Astronomy
Scientific paper
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 [O I] 63 μm and [C II] 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 H_2 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 [C II], CO, and FIR continuum emission from the z=6.4 quasar SDSS J1148+5251. The implications for ALMA observations of starbursts, particularly of [C II] and [O I] in galaxies with low metallicity at high redshift, are discussed.
Hollenbach David J.
Kaufman Michael J.
Wolfire Mark G.
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