SUMMARY OF PROPOSAL 51267
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
KANAGAWA JAPAN 229
SAGAMIHARA
YOSHINODAI3-1-1
Tel: 0427-51-3911(2612) Fax: 0427-59-4253
Medium: 2.5GB8MM
Subject: COSMIC X-RAY BACKGROUND AND DEEP SURVEYS AND OTHER
CROSS IDENTIFICATION OF THE 'NEW HARD SOURCE' DETECTED IN LSS - ONE OF THE MOST PROBABLE CANDIDATES FOR CXB -
ABSTRACT
In the ASCA Large Sky Survey(LSS),we detected about 70 sources, some of which have extremely hard spectrum. This result indicates a possibility to solve the 'spectral paradox',which has puzzuled astrophysicists for more than 30 years. We propose to observe LSS1983+310 , one of the hardest sources detected in LSS(GIS photon index 0.9). Preliminary optical identification shows that spectrum of the candidate seems to have peculiar line profiles, indicating this could be a 'rare' kind of object. We will also observe it with ROSAT HRI this year. The deep observation of this source with ASCA gives us a new sight to understand the origin of the Cosmic Xray Background.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| YOSHIHIRO UEDA | ISAS | JAPAN |
| TADAYUKI TAKAHASHI | ISAS | JAPAN |
| TAKESHI TSURU | KYOTO UNIV. | JAPAN |
| HAJIME INOUE | ISAS | JAPAN |
| MASAAKI SAKANO | KYOTO.UNIV. | JAPAN |
| MASAYUKI AKIYAMA | KYOTO.UNIV. | JAPAN |
| KOUJI OHTA | KYOTO.UNIV | JAPAN |
| TORU YAMADA | TOUHOKU.UNIV | JAPAN |
| YASUSHI OGASAKA | NASA/GSFC | JAPAN |
| YOSHITAKA ISHISAKI | TOKYOMET.UNIV | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)LSS1983+310 | 2 | 198.3413 | 31.0097 | 80 ks | N | Y | P | 0.00200 | 2 |
TARGET 1
50KSEC*2(TOTAL 100KSEC) OBSEVATIONS ARE REQUIRED. TIME INTERVAL IS NOT LIMITED STRICTLY, BUT ABOUT A HALF YEAR IS RECOMMENDED.