Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-25
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures. To appear in Acta Cosmologica (proceedings of YERAC 97, Krakow, Poland). Also available at http://www.mr
Scientific paper
A decrement in the Cosmic Microwave Background (CMB) has been observed by the Ryle Telescope towards a pair of, possibly lensed, quasars (PC1643+4631 A&B). Assuming that the decrement is due to the Sunyaev-Zel'dovich (S-Z) effect, this is indicative of a very rich intervening cluster, although no X-ray emission has yet been observed in that direction. In order to investigate these problems, we present a new model for the formation of distant spherically symmetric clusters in an expanding Universe. Computation of photon paths allows us to evaluate the gravitational effects on CMB photons passing through the evolving mass (i.e. Rees Sciama effect). The lensing properties of the cluster are also considered so that the model can be applied to the PC1643+4631 case to retrieve both the S-Z flux and the separation of the quasar pair. We find that the Rees Sciama effect might contribute significantly to the overall observed CMB decrement.
No associations
LandOfFree
Invisible Clusters and CMB Decrements 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 Invisible Clusters and CMB Decrements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Invisible Clusters and CMB Decrements will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-201441