SUMMARY OF PROPOSAL 71162
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
3-1-1 YOSHINODAI
SAGAMIHARA
KANAGAWA JAPAN 229-8510
Tel: 0427-59-8138 Fax: 0427-59-4240
Medium: 2.5GB8MM
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS
A SEARCH FOR X-RAY EMISSION TOWARDS THE S-Z CLUSTER CANDIDATE IN THE DIRECTION OF THE QUASAR PAIR PC1643+4631
ABSTRACT
The interferometric observation with the 15 GHz Ryle Telescope of the quasar pair PC 1643+4631 A, B (z = 3.79, 3.83, image separation 198'') shows a decrement in the cosmic microwave background (CMB) in the direction, which is due to a cluster with mass >~ 10^15 M_SUN at a redshift z >~1 and might also be responsible for the double image of a single quasar. The ROSAT PSPC observation at the position of the decrement shows that there is no evidence for emission by hot gas which could give rise to the Sunyaev-Zel'dovich effect. We propose deep field survey at the position of the decrement with ASCA to detect evidence for the distant cluster.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| HIROHIKO HONDA | ISAS | JAPAN |
| AKIHIRO FURUZAWA | NAGOYA UNIVERSITY | JAPAN |
| KOUJUN YAMASHITA | NAGOYA UNIVERSITY | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)PC1643+4631A,B | B | 251.2579 | 46.4379 | 100 ks | N | Y | P | 0.01000 | 1 |