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

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2 Citations (Scopus)

Abstract

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
JournalJournal of the Korean Physical Society
Volume45
Issue numberSUPPL.
Publication statusPublished - 01-10-2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Suto, Y., Yoshikawa, K., Yamasaki, N. Y., Mitsuda, K., Fujimoto, R., Furusho, T., Ohashi, T., Ishida, M., Sasaki, S., Ishisaki, Y., Tawara, Y., & Furuzawa, A. (2004). Searching for cosmic missing baryons with DIOS - Diffuse intergalactic oxygen surveyor. Journal of the Korean Physical Society, 45(SUPPL.).