SUMMARY OF PROPOSAL 73020
UNIVERSITY OF LEICESTER
UNIVERSITY ROAD
LEICESTER
LEICESTERSHIRE UK LE1 7RH
Tel: +44 116 252 3557 Fax: +44 116 252 3311
Medium: CD ROM
Subject: AGN
THE SOFT X-RAY EXCESSES OF QUASARS
ABSTRACT
Soft X-ray excess emission from AGN is thought to be the hard or high energy tail end of the Big Blue Bump in the UV; the direct thermal emission from the accretion disk of the central super-massive black hole. More recent evidence has shown that the emission temperature of the soft X-ray excess is too high to originate directly from the disk and that more complex models involving Comptonisation of disk photons by a hot accretion disk corona could produce the observed properties of the soft excess. We propose ASCA observations of luminous quasars with known strong soft excess emission to test the properties of the soft excess.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| MARTIN TURNER | UNIV OF LEICESTER | UK |
| STEVE SEMBAY | UNIV OF LEICESTER | UK |
| PAUL O'BRIEN | UNIV OF LEICESTER | UK |
| TSUNEO KII | ISAS | JAPAN |
| TAKAYA OHASHI | TOKYO METRO UNIV | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)PG 1426+015 | B | 217.2771 | 1.2850 | 30 ks | N | N | P | 0.97400 | 1 |
| 2)PHL 1657 | B | 324.4379 | -14.5486 | 30 ks | N | N | P | 0.68600 | 1 |