期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 395, 期 2, 页码 657-666出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.14547.x
关键词
galaxies: clusters: general; galaxies: clusters: individual: PKS 0745-191; X-rays: galaxies: clusters
资金
- Herschel Smith Scholarship
- Science and Technology Facilities Council [ST/G002339/1] Funding Source: researchfish
- STFC [ST/G002339/1] Funding Source: UKRI
We measure X-ray emission from the outskirts of the cluster of galaxies PKS 0745-191 with Suzaku, determining radial profiles of density, temperature, entropy, gas fraction and mass. These measurements extend beyond the virial radius for the first time, providing new information about cluster assembly and the diffuse intracluster medium out to similar to 1.5 r(200) (r(200) similar or equal to 1.7Mpc similar or equal to 15 arcmin). The temperature is found to decrease by roughly 70 per cent from 0.3 to 1r(200). We also see a flattening of the entropy profile near the virial radius and consider the implications this has for the assumption of hydrostatic equilibrium when deriving mass estimates. We place these observations in the context of simulations and analytical models to develop a better understanding of non-gravitational physics in the outskirts of the cluster.
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