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

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

Aug, 2006

12 pages

Published in:

Publ.Astron.Soc.Jap. 59 (2007) 339-349

e-Print:

astro-ph/0608072 [astro-ph]

DOI:

10.1093/pasj/59.sp1.S339

Report number:

SLAC-PUB-12041

View in:

ADS Abstract Service

reference search13 citations

Citations per year

Abstract: (arXiv)

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.

COSMOLOGY
LSS
IGM
X-RAYS DIFFUSE BACKGROUND

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