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- W3100811580 abstract "At least 50% of the baryons in the local universe are undetected and predicted to be in a hot dilute phase (105–107 K) in low and moderate overdensity environments. We searched for the predicted diffuse faint emission through shadowing observations whereby cool foreground gas absorbs more distant diffuse emission. Observations were obtained with Chandra and XMM-Newton. Using the cold gas in two galaxies, NGC 891 and NGC 5907, shadows were not detected and a newer observation of NGC 891 fails to confirm a previously reported X-ray shadow. Our upper limits lie above model predictions. For Local Group studies, we used a cloud in the Magellanic Stream and a compact high-velocity cloud to search for a shadow. Instead of a shadow, the X-ray emission was brighter toward the Magellanic Stream cloud and there is a less significant brightness enhancement toward the other cloud also. The brightness enhancement toward the Magellanic Stream cloud is probably due to an interaction with a hot ambient medium that surrounds the Milky Way. We suggest that this interaction drives a shock into the cloud, heating the gas to X-ray emitting temperatures." @default.
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- W3100811580 date "2009-06-25" @default.
- W3100811580 modified "2023-09-26" @default.
- W3100811580 title "X-RAY SEARCHES FOR EMISSION FROM THE WHIM IN THE GALACTIC HALO AND THE INTERGALACTIC MEDIUM" @default.
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- W3100811580 doi "https://doi.org/10.1088/0004-637x/699/2/1765" @default.
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