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• W2066659330 endingPage "L34" @default.
• W2066659330 startingPage "L29" @default.
• W2066659330 abstract "To detect a warm-hot intergalactic medium associated with the large-scale structure of the universe, we observed a quasar behind the Virgo cluster with XMM-Newton. With a net exposure time of 54 ks, we marginally detected an OVIII K alpha absorption line at 650.9 +0.8/-1.9 eV in the RGS spectra, with a statistical confidence of 96.4 %. The observed line center energy is consistent with the redshift of M87, and hence the absorber is associated with the Virgo cluster. From the curve of growth, the OVIII column density was estimated to be > 7 x 10^16 cm^-2. In the EPIC spectra, excess emission was found after evaluating the hot intracluster medium in the Virgo cluster and various background components. We inspected the ROSAT All-Sky Survey map of the diffuse soft X-ray background, and confirmed that the level of the north and west regions just outside of the Virgo cluster is consistent with the background model that we used, while that of the east side is significantly higher and the enhancement is comparable with the excess emission found in the EPIC data. We consider a significant portion of the excess emission to be associated with the Virgo cluster, although a possible contribution from the North Polar Spur cannot be excluded. Using the column density and the emission measure and assuming an oxygen abundance of 0.1 and an ionization fraction of 0.4, we estimate that the mean electron density and the line-of-sight distance of the warm-hot gas are < 6 x 10^-5 cm^-3 and > 9 Mpc, respectively. These numbers strongly suggest that we have detected a warm-hot intergalactic medium in a filament associated with the Virgo cluster." @default.
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• W2066659330 date "2004-10-25" @default.
• W2066659330 modified "2023-09-27" @default.
• W2066659330 title "Probing Warm-Hot Intergalactic Medium Associated with the Virgo Cluster Using an Oxygen Absorption Line" @default.
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• W2066659330 doi "https://doi.org/10.1093/pasj/56.5.l29" @default.
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