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- W1577395812 abstract "We studied the physical properties of the intracluster medium in the virialization region of a sample of 320 clusters ($0.056 3$ keV) in the Chandra archive. We stacked the emission measure profiles of the clusters to detect a signal out to and beyond $R_{200}$. We then measured the average emission measure, gas density and gas fraction. We observe a steepening of the density profiles beyond $R_{500}$ with $beta sim 0.68$ at $R_{500}$ and $beta sim 1$ at $R_{200}$ and beyond. By tracking the direction of the cosmic filaments where the clusters are embedded, we report that galaxy clusters deviate from spherical symmetry, with only small differences between relaxed and disturbed systems. We also did not find evolution of the gas density with redshift, confirming the self-similar evolution of the gas density. The value of the baryon fraction reaches the cosmic value at $R_{200}$: however, systematics due to non-thermal pressure support and clumpiness might enhance the measured gas fraction, leading to an actual deficit of the baryon budget with respect to the primordial value. This study has important implications for understanding the ICM physics in the outskirts." @default.
- W1577395812 created "2016-06-24" @default.
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- W1577395812 date "2015-01-16" @default.
- W1577395812 modified "2023-09-27" @default.
- W1577395812 title "The galaxy cluster outskirts via stacking" @default.
- W1577395812 hasPublicationYear "2015" @default.
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