Offset between dark matter and ordinary matter: Evidence from a sample of 38 lensing clusters of galaxies

Huan Yuan Shan*, Bo Qin, Bernard Fort, Charling Tao, Xiang Ping Wu, Hong Sheng Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

We compile a sample of 38 galaxy clusters which have both X-ray and strong lensing observations, and study for each cluster the projected offset between the dominant component of baryonic matter centre (measured by X-rays) and the gravitational centre (measured by strong lensing). Among the total sample, 45 per cent clusters have offsets >10 arcsec. The >10 arcsec separations are significant, considering the arcsecond precision in the measurement of the lensing/X-ray centres. This suggests that it might be a common phenomenon in unrelaxed galaxy clusters that gravitational field is separated spatially from the dominant component of baryonic matter. It also has consequences for lensing models of unrelaxed clusters since the gas mass distribution may differ from the dark matter distribution and give perturbations to the modelling. Such offsets can be used as a statistical tool for comparison with the results of Lambda cold dark matter (ΛCDM) simulations and to test the modified dynamics.

Original languageEnglish
Pages (from-to)1134-1139
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume406
Issue number2
DOIs
Publication statusPublished - 1 Aug 2010

Keywords

  • Dark matter
  • Gravitational lensing: strong
  • X-rays: galaxies: clusters

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