Locating the warm-hot intergalactic medium in the simulated local universe

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

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


We present an analysis of mock spectral observations of warm-hot intergalactic medium (WHIM) using a constrained simulation of the local universe. The simulated map of oxygen emission lines from local WHIM well reproduces the observed structures traced by galaxies in the real local universe. We further attempt to perform mock observation of the outer parts of the simulated Coma cluster and A 3627 adopting the expected performance of DIOS (Diffuse Intergalactic Oxygen Surveyor), which is proposed as a dedicated soft X-ray mission to search for cosmic missing baryons. We find that WHIMs surrounding nearby clusters are detectable with a typical exposure time of one day, and thus constitute realistic and promising targets for DIOS. We also find that an X-ray emitting clump in front of Coma cluster, recently reported in the XMM-Newton observation, has a counterpart in the simulated local universe, and its observed spectrum can be well reproduced in the simulated local universe if the gas temperature is set to the observationally estimated value.

Original languageEnglish
Pages (from-to)939-957
Number of pages19
JournalPublications of the Astronomical Society of Japan
Issue number6
Publication statusPublished - 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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