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We searched for redshifted O emission lines from the possible warm-hotintergalactic medium (WHIM) surrounding the cluster of galaxies A2218 atz=0.1756 using the XIS instrument on Suzaku. This cluster is thought to have anelongated structure along the line of sight based on previous studies. Westudied systematic uncertainties in the spectrum of the Galactic emission andin the soft X-ray response of the detectors due to the contamination buildingup on the XIS filters. We detected no significant redshifted O lines, and set atight constraint on the intensity with upper limits for the surface brightnessof OVII and OVIII lines of 1.1 x 10^-7 and 3.0 x 10^-7 photons cm^-2 s^-1arcmin^-2, respectively. These upper limits are significantly lower than thepreviously reported fluxes from the WHIM around other clusters of galaxies. Wealso discuss the prospect for the detection of the WHIM lines with Suzaku XISin the future.Comment: 12 pages, 13 figures. Accepted for publication in PASJ Suzaku special  issue (Vol.59, No.SP1

Search for Oxygen Emission from Warm-Hot Intergalactic Medium around A2218 with Suzaku