The Effect of Coupled Dark Energy on the Alignment between Dark Matter and Galaxy Distributions in Clusters

Details The Effect of Coupled Dark Energy on the Alignment between Dark Matter and Galaxy Distributions in Clusters The Effect of Coupled Dark Energy on the Alignment between Dark Matter and Galaxy Distributions in Clusters

2011-01-30

arxiv.org/abs/1101.5761v3

Astrophys.J. 732 (2011) 112

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for publication in ApJ, published version, all minor typos corrected, 5 figures

Scientific paper

We investigate the effects of a coupled Dark Energy (cDE) scalar field on the alignment between satellites and matter distributions in galaxy clusters. Using high-resolution N-body simulations for LCDM and cDE cosmological models, we compute the probability density distribution for the alignment angle between the satellite galaxies and underlying matter distributions, finding a difference between the two scenarios. With respect to LCDM, in cDE cosmologies the satellite galaxies are less preferentially located along the major axis of the matter distribution, possibly reducing the tension with obersevational data. A physical explanation is that the coupling between dark matter and dark energy acts as an additional tidal force on the satellite galaxies diminishing the alignments between their distribution and the matter one. Through a Wald test based on the generalized chi-square statistics, the null hypothesis that the two probability distributions come from the same parent population is rejected at the 99 % confidence level. It is concluded that the galaxy-matter alignment in clusters may provide a unique probe of dark sector interactions as well as the nature of dark energy.

Affiliated with

Also associated with

No associations

Rating

The Effect of Coupled Dark Energy on the Alignment between Dark Matter and Galaxy Distributions in Clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Effect of Coupled Dark Energy on the Alignment between Dark Matter and Galaxy Distributions in Clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Effect of Coupled Dark Energy on the Alignment between Dark Matter and Galaxy Distributions in Clusters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-157787