[113.03] Molecular Hydrogen as a probe of physical conditions in high red-shift Damped Ly$\alpha$ Absorbers

AAS 203rd Meeting, January 2004
Session 113 Molecules and Atoms at High Z and Low Z
Poster, Thursday, January 8, 2004, 9:20am-4:00pm, Grand Hall

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[113.03] Molecular Hydrogen as a probe of physical conditions in high red-shift Damped Ly\alpha Absorbers

G. Shaw, G. Ferland (Department of Physics and Astronomy, University of Kentucky), R. Srianand (IUCAA, India)

Molecular Hydrogen plays an important role in astrophysics. It is the first and the most abundant neutral molecule to be formed in the Universe. We consider a complete model of the H₂ molecule that we have implemented in the spectra simulation code Cloudy. The H₂ molecule has 1893 levels which produces tens of thousand lines. We consider all physical processes, including ionization, heating, cooling, molecule formation, and grain physics, simultaneously and self-consistently, extending from the H II region through the PDR and molecular cloud. We present column density diagnostic diagrams that allow the physical conditions in high red-shift DLAs to be determined.

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