SUMMARY OF PROPOSAL 81506
KYOTO UNIVERSITY
KITASHIRAKAWA-OIWAKE-CHO SAKYO-KU
KYOTO
KYOTO JAPAN 606-8502
Tel: (81)-75-753-3867 Fax: (81)-75-753-3799
Medium: CD ROM
Subject: SUPERNOVA REMNANTS AND GALACTIC DIFFUSE EMISSION
NEW X-RAY REFLECTION NEBULA SGR C
ABSTRACT
With ASCA, we found a new category of X-ray objects, "X-ray reflection nebula" Sgr B2. This source is characterized by very strong 6.4-keV line from neutral iron, and it is considered that the giant molecular cloud is irradiated by an external X-ray source and emits only fluorescent and reflected X-rays. However, there is no strong X-ray source around Sgr B2. The most clear explanation for this probrem is that the Galactic nucleus Sgr A* had been bright, but is currently dim. To confirm this hypothesis, we propose to observe Sgr C cloud, which also emits strong 6.4-keV line and new candidate of the "X-ray reflection nebula". By studying the time variability of this source, we can verify whether the Sgr C is "X-ray reflection nebula" or not.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| KATSUJI KOYAMA | KYOTO UNIVERSITY | JAPAN |
| YOSHITOMO MAEDA | PENN. STATE UNIV. | JAPAN |
| MASAAKI SAKANO | KYOTO UNIVERSITY | JAPAN |
| MASAHIRO TSUJIMOTO | KYOTO UNIVERSITY | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)SGR_C | B | 266.1000 | -29.4244 | 20 ks | N | Y | P | 0.10000 | 1 |