SUMMARY OF PROPOSAL 51009
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
JAPAN JAPAN 229
SAGAMIHARA
3-1-1 YOSHINODAI
Tel: 0427-51-3911 EXT.2612 Fax: 0427-59-4253
Medium: 4GBDAT
Subject: STARS
OBSERVATIONS OF NEARBY SINGLE WHITE DWARFS AS POSSIBLE CANDIDATES OF THE GALACTIC RIDGE EMISSION
ABSTRACT
Galactic Ridge Emission (GRE) is the emission from optically thin thermal plasma spread over the inner galactic disk with a scale height of 100pc. It is still a matter of debate whether it originates from truely diffusive gas filling the entire disk or from superposition of individual X-ray sources. We propose to observe nearby single white dwarfs in order to detect hard X-rays caused by accretion of the interstellar matter. According to a simple estimation, the integration of this emission over the entire inner galactic disk can explain the amount and spectral properties of GRE.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| HAJIME INOUE | ISAS | JAPAN |
| RYUICHI FUJIMOTO | ISAS | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)VAN MAANEN 2 | 2 | 12.2625 | 5.4447 | 40 ks | N | Y | P | 0.07000 | 1 |
| 2)LHS 27 | 2 | 67.7708 | 58.9958 | 40 ks | N | Y | P | 0.04000 | 1 |