Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000isass..14...67s&link_type=abstract
The Institute of Space and Astronautical Science Report SP No. 14, p. 67-74.
Astronomy and Astrophysics
Astrophysics
Infrared Radiation, Interstellar Matter, Galaxy Formation, Infrared Spectroscopy
Scientific paper
The observability of Hydrogen molecules in absorption is investigated. For solar abundances, such as in the Galaxy, the absorption measurement is very difficult because the absorption efficiency of the Hydrogen molecular absorption lines is significantly smaller than that of dust grains. On the other hand, in the metal-poor condition as expected in the early Universe, the absorption efficiency of the Hydrogen molecules become comparable with or larger than that of the dust grains. If we could use bright infrared sources behind the molecular gas clouds, the absorption measurement of the Hydrogen molecules would be an important technique to analyze the primordial gas clouds that are contracting into first-generation objects. The SPICA (Space Infrared Telescope for Cosmology and Astrophysics) will be sensitive enough to detect a molecular gas could of 1024 cm-2 against an infrared source of 10 mJy flux. These observations would be able to reveal the distribution of the primordial molecular gas clouds in the early Universe.
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