SUMMARY OF PROPOSAL 81411
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: X-RAY BINARIES
EXTREMELY HARD X-RAY SOURCES IN THE GALACTIC CENTER REGION
ABSTRACT
In the Galactic Center survey, ASCA resolved many point sources in the region through the heavy interstellar absorption for the first time. Some of them were found to show unusually hard spectra. They are probably one of unusual objects, such as X-ray pulsar or black hole. In particular, one of the targets, AX J1739.1-3021, showed an extremely strong flare with more than 2-order magnitude variability in only 1000sec. We here propose the long observations of three of those unusually hard objects which have been not identified, yet. Our first objective is to detect time variability and then to reveal their natures. In addition to the interest to their natures themselves, they would give some important implication on the star formation history in the Galactic Center region.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| KATSUJI KOYAMA | KYOTO UNIVERSITY | JAPAN |
| HIROSHI MURAKAMI | KYOTO UNIVERSITY | JAPAN |
| SHIGEO YAMAUCHI | IWATE UNIVERSITY | JAPAN |
| TADAYASU DOTANI | ISAS | JAPAN |
| FUMIAKI NAGASE | ISAS | JAPAN |
| KEN'ICHI TORII | NASDA | JAPAN |
| YOSHITOMO MAEDA | PEN-STATE UNIVERSITY | USA |
| KENZO KINUGASA | GUNMA ASTRON. OBS. | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)AXJ1739.1-3035 | B | 264.7833 | -30.3500 | 200 ks | N | Y | P | 0.50000 | 1 |