Searching for cosmic missing baryons with DIOS - Diffuse intergalactic oxygen surveyor

Yasushi Suto, Kohji Yoshikawa, Noriko Y. Yamasaki, Kazuhisa Mitsuda, Ryuichi Fujimoto, Tae Furusho, Takaya Ohashi, Manabu Ishida, Shin Sasaki, Yoshitaka Ishisaki, Yuzuru Tawara, Akihiro Furuzawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Approximately 30 to 50 percent of the total baryons in the present universe is supposed to take the form of wa arm/hot intergalactic medium (WHIM) whose X-ray continuum emission is very weak. In order to carry out a direct and homogeneous survey of elusive cosmic missing baryons, we propose a dedicated soft-X-ray mission, DIOS (Diffuse Intergalactic Oxygen Surveyor). The unprecedented energy resolution (∼ 2eV) of the XSA (X-ray Spectrometer Array) on-board DIOS enables us to identify WHIM with gas temperatures T = 106-7K and overdensity δ= 10-100 located at z < 0.3 through emission lines of OVII and OVIII. DIOS, which will hopefully be launched in several years time, promises to open a new window of detection and characterization of cosmic missing baryons and to provide yet another important and complementary tool to trace the large-scale structure of the universe.

Original languageEnglish
Pages (from-to)S110-S117
JournalJournal of the Korean Physical Society
Issue numberSUPPL.
Publication statusPublished - 10-2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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