Evolution of the intergalactic medium and UV background radiation

• 池内, 了

• OKOSHI, Katsuya

• IKEUCHI, Satoru

書誌事項

タイトル別名

• Evolution of the Intergalactic Medium a

抄録

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We discuss the evolutions of the intensity and spectrum of the UV background radiation (UVB) in flat and open cold dark-matter universes. We consider two kinds of UV sources: one is QSOs, the other is collapsing objects, which liberate their binding energy radiatively. In the latter sources, we include the line emission corresponding to collisional excitation cooling of HeII as well as free-free emission. We find that UV photons emitted from collapsing objects contribute to UVB as much as those from QSOs, and that the UVB spectrum becomes softer than that in the case in which only QSOs are taken into account. We also calculate the Gunn-Peterson optical depths assuming the ionization equilibrium, and compare them with observations.

収録刊行物

• Publications of the Astronomical Society of Japan

  Publications of the Astronomical Society of Japan 48 (3), 441-465, 1996-08

  The Astronomical Society of Japan

詳細情報

• CRID: 1050001338928163328
• NII論文ID: 10002595004
• NII書誌ID: AA1082896X
• ISSN: 00046264
• NDL書誌ID: 3997531
• Web Site: https://ir.soken.ac.jp/records/3299
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3997531
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
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  • NDL
  • CiNii Articles