SUMMARY OF PROPOSAL 71139
OSAKA UNIVERSITY
1-1, MACHIKANEYAMA
TOYONAKA
OSAKA JAPAN 560-0043
Tel: 81-6-850-5476 Fax: 81-6-850-5539
Medium: 2.5GB8MM
Subject: AGN
SEARCH FOR HIGH-LOW (SOFT-HARD) TRANSITION IN THE X-RAY SPECTRUM OF AGNS
ABSTRACT
Steller black hole candidates (SBHC) shows two distinctive states depending on the X-ray flux; High state and Low state. The latter state is characterized with a hard power low spectrum and rapid variavility. AGN is believed to be a system with a super massive black hole. Its X-ray spectrum and variability resembles the SBHC in its low state. Nevertheless, a new class of AGNs showing extremely soft spectrum ( resembleing SBHC high state) has been found. Most of them are classified as narrow line Seyfert 1 type. So far, however, no transition was observed for a particular AGNs between low to hard state. In this proposal, we try to catch it by observing 6 NLS1s which was previously observed with ASCA and showed sfot spectrum. IRAS
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| KIYOSHI HASHIMOTODANI | OSAKA UNIVERSITY | JAPAN |
| TAKAYOSHI KOHMURA | OSAKA UNIVERSITY | JAPAN |
| HIDEKI OGATA | OSAKA UNIVERSITY | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)IRAS13224-3809 | C | 201.3350 | -38.4166 | 15 ks | N | Y | P | 0.10000 | 1 |
| 2)H0707-495 | C | 107.1725 | -49.5684 | 15 ks | N | Y | P | 0.10000 | 1 |