| Issue |
EAS Publications Series
Volume 4, 2002
Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra
|
|
|---|---|---|
| Page(s) | 387 - 387 | |
| Section | Posters | |
| DOI | https://doi.org/10.1051/eas:2002106 | |
| Published online | 25 September 2002 | |
M. Giard, J.P. Bernard, A. Klotz and I. Ristorcelli (eds)
EAS Publications Series, 4 (2002) 387
H2 Absorption Measurement of Primordial Clouds
1
Nagoya University, Nagoya, Japan
2
National Astronomical Observatory, Mitaka, Tokyo, Japan
3
Instituto Nacional de Astrofisica Optica y Electronica, Tonantzintla, Mexico
4
Osservatorio Astrofisico di Arcetri, Firenze, Italy
Corresponding author: shibai@phys.nagoya-u.ac.jp
The observability of hydrogen molecules in absorption was investigated for infrared lines against bright infrared sources. The absorption efficiency of the hydrogen molecules becomes comparable with or larger than that of the dust grains in the metal-poor condition expected in the early Universe. If we can use bright infrared continuum sources behind the molecular gas clouds, the absorption measurement of the hydrogen molecules will be an important technique to explore the primordial gas clouds that are contracting into first-generation objects.
© EAS, EDP Sciences, 2002