SUMMARY OF PROPOSAL 71123
RIKEN
2-1, HIROSAWA
WAKO
SAITAMA JAPAN 351-0198
Tel: 048-462-1111(EX.3229) Fax: 048-462-4640
Medium: 4GBDAT
Subject: AGN
SIMULTANEOUS X-RAY AND TEV GAMMA-RAY OBSERVATIONS OF BL LAC OBJECT PKS0548-322
ABSTRACT
We propose to observe BL Lac object PKS0548-322 with ASCA and a TeV gamma-ray telescope. This source is classified as High frequency BL Lac objects (HBLs) whose emission could extend up to TeV gamma-ray band. Since TeV photon from extragalactic objects is absorbed by the cosmic infrared background (CIB) and the density of CIB is unknown, we can not know the cutoff of TeV spectrum of HBLs is intrinsic or due to absorption by CIB. There is a plausible argument that the TeV emission of HBLs is Synchrotron-Self-Compton emission by electrons radiating X-ray emission. In order to know intrinsic energy spectrum of electrons, simultaneous observations both in the X-ray and TeV gamma-ray band is crucial. These observations may also give clue to the cosmic gamma-ray background as well as CIB.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| MASARU MATSUOKA | RIKEN | JAPAN |
| FUMIYOSHI MAKINO | ISAS | JAPAN |
| TADAYUKI TAKAHASHI | ISAS | JAPAN |
| JUN KATAOKA | ISAS | JAPAN |
| MAKOTO TASHIRO | UNIV. OF TOKYO | JAPAN |
| TADASHI KIFUNE | ICRR | JAPAN |
| MASAKI MORI | ICRR | JAPAN |
| AKIKO KAWACHI | ICRR | JAPAN |
| SUSUMU INOUE | ICRR | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)PKS0548-322 | B | 87.6700 | -32.2716 | 40 ks | N | Y | P | 1.20000 | 4 |