Absorption Measurement of Hydrogen Molecules in the Early Universe | Zendy

Hiroshi Shibai | Zendy; Tsutomu T. Takeuchi | Zendy; T. N. Rengarajan | Zendy; Hiroyuki Hirashita | Zendy

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Absorption Measurement of Hydrogen Molecules in the Early Universe

Author(s) -

Hiroshi Shibai,

Tsutomu T. Takeuchi,

T. N. Rengarajan,

Hiroyuki Hirashita

Publication year - 2001

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/53.4.589

Subject(s) - physics , absorption (acoustics) , hydrogen , hydrogen molecule , observability , molecule , universe , astrophysics , molecular cloud , chemical physics , astronomy , atomic physics , optics , stars , quantum mechanics , mathematics

We investigate the observability of hydrogen molecules in absorption. Theabsorption efficiency of the hydrogen molecules become comparable with orlarger than that of the dust grains in the metal-poor condition expected in theearly Universe. If we can use bright infrared continuum sources behind themolecular gas clouds, the absorption measurement of the hydrogen molecules willbe an important technique to explore the primordial gas clouds that arecontracting into first-generation objects.Comment: 5 pages, to be published in PASJ, August 25, 200

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