Mass discrepancy in galaxy clusters as a result of the offset between dark matter and baryon distributions

HuanYuan Shan, Bo Qin, HongSheng Zhao

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Recent studies of lensing clusters reveal that it might be fairly common for a galaxy cluster that the X-ray center has an obvious offset from its gravitational center 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 two 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.
Original languageEnglish
Pages (from-to)1277-1282
JournalMonthly Notices of the Royal Astronomical Society
Volume408
Issue number2
DOIs
Publication statusPublished - 21 Oct 2010

Fingerprint

Dive into the research topics of 'Mass discrepancy in galaxy clusters as a result of the offset between dark matter and baryon distributions'. Together they form a unique fingerprint.

Cite this