Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-03
Publ.Astron.Soc.Jap.59:339-349,2007
Astronomy and Astrophysics
Astrophysics
12 pages, 13 figures. Accepted for publication in PASJ Suzaku special issue (Vol.59, No.SP1)
Scientific paper
We searched for redshifted O emission lines from the possible warm-hot intergalactic medium (WHIM) surrounding the cluster of galaxies A2218 at z=0.1756 using the XIS instrument on Suzaku. This cluster is thought to have an elongated structure along the line of sight based on previous studies. We studied systematic uncertainties in the spectrum of the Galactic emission and in the soft X-ray response of the detectors due to the contamination building up on the XIS filters. We detected no significant redshifted O lines, and set a tight constraint on the intensity with upper limits for the surface brightness of OVII and OVIII lines of 1.1 x 10^-7 and 3.0 x 10^-7 photons cm^-2 s^-1 arcmin^-2, respectively. These upper limits are significantly lower than the previously reported fluxes from the WHIM around other clusters of galaxies. We also discuss the prospect for the detection of the WHIM lines with Suzaku XIS in the future.
Arnaud A. A. K.
Bautz Mark W.
Fujimoto Ryuichi
Hayashida Kiyoshi
Henry Patrick J.
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