SUMMARY OF PROPOSAL 61196
THE INSTITUTE OF PHYSICAL AND CHEMICAL RESEARCH (RIKEN)
SAITAMA JAPAN 351-01
WAKO
2-1 HIROSAWA
Tel: +81-48-462-1111 EX.3229 Fax: +81-48-462-4640
Medium: 2.5GB8MM
Subject: CLUSTERS OF GALAXIES AND SUPERCLUSTERS
GIANT GRAVITATIONALLY LENSED ARC ASSOCIATED WITH A BL LAC:STUDY OF X-RAY EMISSION FROM AN UNKNOWN CLUSTER OF GALAXIES
ABSTRACT
We propose an ASCA study of the surroundings of RX J174537.0+3951, which was recently identified as a BL Lac from the ROSAT--5 GHz Green Bank correlations. The BL Lac lives in a truly exceptional optical environment. The object is associated with a galaxy which is the end of a linear chain of compact objects. South of the BL Lac is a large arc - the only arc known to be associated with an AGN up to now. The arc indicates gravitaional lensing and thus the BL Lac might reside in a currently unknown cluster of galaxies. The ASCA study aims at investigating the X-ray emission of the BL Lac and its surroundings, in order to determine the origin of the X-ray emission by means of its X-ray spectrum. The ASCA observation complements a detailed spatial analysis with ROSAT HRI.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| MASARU MATSUOKA | RIKEN | JAPAN |
| TATEHIRO MIHARA | RIKEN | JAPAN |
| MAKOTO HATTORI | TOHOKU UNIV. | JAPAN |
| WOLFGANG BRINKMANN | MPE | GERMANY |
| JOACHIM SIEBERT | MPE | GERMANY |
| LEO TAKALO | TUORLA OBSERVATORY | FINLAND |
| AIMO SILLANPAA | TUORLA OBSERVATORY | FINLAND |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)RXJ174537.3+3951 | 3 | 266.4054 | 39.8578 | 40 ks | N | N | P | 0.11000 | 1 |