Evidence for earlier formation epochs of fossil groups of galaxies: the case for J100742.53+380046.6
Abstract
Fossil groups of galaxies still present a puzzle to theories of structure formation. Despite the low number of bright galaxies, their have relatively high velocity dispersions and IGM temperatures corresponding to cluster-like potential wells. Their measured c200 are high indicating early formation epochs in contradiction with the observed lack of expected well developed cool cores. We have recently proposed an independent age discriminatory test, using a recently found cluster dynamical indicator in the intracluster light color distribution and its ratio to cluster's mass. We present here the preliminary results using HST and XMM data for J100742.53+380046.6.
- Publication:
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AAS/High Energy Astrophysics Division
- Pub Date:
- March 2019
- Bibcode:
- 2019HEAD...1710713D