Journal Article

Absorption Measurement of Hydrogen Molecules in the Early Universe

Hiroshi Shibai, Tsutomu T. Takeuchi, T. N. Rengarajan and Hiroyuki Hirashita

in Publications of the Astronomical Society of Japan

Volume 53, issue 4, pages 589-593
Published in print August 2001 | ISSN: 0004-6264
Published online August 2001 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/53.4.589
Absorption Measurement of Hydrogen Molecules in the Early Universe

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  • Galaxies
  • Astronomy and Astrophysics
  • Interstellar Medium

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We investigate the observability of hydrogen molecules in absorption. The absorption efficiency of 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 could be an important technique to explore the primordial gas clouds that are contracting into first-generation objects.

Keywords: galaxies: formation; infrared: ISM; ISM: lines and bands; ISM: clouds, molecules

Journal Article.  2880 words.  Illustrated.

Subjects: Galaxies ; Astronomy and Astrophysics ; Interstellar Medium

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