SUMMARY OF PROPOSAL 51117
RIKEN
SAITAMA JAPAN 351-01
WAKO-SHI
HIROSAWA 2-1
Tel: 048-462-1111 EXT3221 Fax: 048-462-4640
Medium: 4GBDAT
Subject: NORMAL GALAXIES
SEARCH FOR HARD X-RAY EMISSION FROM THE HIDDEN MBH IN THE ELLIPTICAL GALAXY NGC 3377
ABSTRACT
ASCA observations have been extremely powerful in discovering low-Lx active nuclei in a large number of spiral galaxies. The most spectacular example is for the Sbc galaxy NGC 4258: water maser measurements indicated the presence of a hidden massive black hole (MBH) of 10**7-8 solar masses (Miyoshi et al. 1995) and ASCA promptly discovered a low-Lx nuclear activity in this galaxy (Makishima et al.1994). On the other side, though most giant elliptical galaxies are believed to possess MBHs, nuclear activity is still elusive in these objects. This is a major unresolved puzzle. We propose then to observe the E galaxy NGC 3377 which is suspected to hide a ~10**8 MBH to search for hard X-ray nuclear activity and test current theoretical models like advection-dominated accretion disk models.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| KOZUE MAKISHIMA | UNIV. OF TOKYO | JAPAN |
| NAOKO IYOMOTO | UNIV. OF TOKYO | JAPAN |
| MASARU MATSUOKA | RIKEN | JAPAN |
| GIORGIO G.C. PALUMBO | UNIV. OF BOLOGNA | ITALY |
| ANDREA COMASTRI | BOLOGNA OBSERV. | ITALY |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)NGC 3377 | 1 | 161.9233 | 13.9833 | 100 ks | N | Y | P | 0.01300 | 1 |