Large scale motions in superclusters: their imprint in the CMB

Details Large scale motions in superclusters: their imprint in the CMB Large scale motions in superclusters: their imprint in the CMB

1999-12-07

arxiv.org/abs/astro-ph/9912117v2

Astrophys.J. 533 (2000) L71-L74

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, ApJ Letters, in press; revised version according to referee's comments

Scientific paper

10.1086/312627

We identify high density regions of supercluster size in high resolution N-body simulations of a representative volume of three Cold Dark Matter Universes. By assuming that (1) the density and peculiar velocities of baryons trace those of the dark matter, and (2) the temperature of plasma is proportional to the velocity dispersion of the dark matter particles in regions where the crossing times is smaller than the supercluster free-fall time, we investigate how thermal motions of electrons in the intra-cluster medium and peculiar velocity of clusters can affect the secondary anisotropies in the cosmic microwave background (CMB). We show that the thermal effect dominates the kinematic effect and that the largest thermal decrements are associated with the most massive clusters in superclusters. Thus, searching for the presence of two or more close large CMB decrements represents a viable strategy for identifying superclusters at cosmological distances. Moreover, maps of the kinematic effect in superclusters are characterized by neighboring large peaks of opposite signs. These peaks can be as high as ~ 10 microK at the arcminute angular resolution. Simultaneous pointed observations of superclusters in the millimeter and submillimeter bands with upcoming sensitive CMB experiments can separate between the thermal and kinematic effect contributions and constrain the evolution of the velocity field in large overdense regions.

Affiliated with

Also associated with

No associations

Rating

Large scale motions in superclusters: their imprint in the CMB 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 Large scale motions in superclusters: their imprint in the CMB, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large scale motions in superclusters: their imprint in the CMB will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-281910