NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-18 T09:23:55 PDT
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For refcode 2010MNRAS.408.1277S:
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Copyright by Royal Astronomical Society. 2010MNRAS.408.1277S Mass discrepancy in galaxy clusters as a result of the offset between dark matter and baryon distributions Shan, Huan Yuan; Qin, Bo; Zhao, Hong Sheng Abstract. Recent studies of lensing clusters reveal that it might be fairly common for a galaxy cluster that the X-ray centre has an obvious offset from its gravitational centre which is measured by strong lensing. We argue that if these offsets exist, then X-rays and lensing are indeed measuring different regions of a cluster, and may thus naturally result in a discrepancy in the measured gravitational masses by the two different methods. Here we investigate theoretically the dynamical effects of such lensing-X-ray offsets and compare with observational data. We find that for typical values, the offset alone can give rise to a factor of 2 difference between the lensing and X-ray-determined masses for the core regions of a cluster, suggesting that such 'offset effect' may play an important role and should not be ignored in our dynamical measurements of clusters. Key words: gravitational lensing: strong, dark matter, X-rays: galaxies: clusters
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