SUMMARY OF PROPOSAL 73020

MR JAMES NOEL REEVES
JNR@STAR.LE.AC.UK

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 TURNERUNIV OF LEICESTERUK
STEVE SEMBAYUNIV OF LEICESTERUK
PAUL O'BRIENUNIV OF LEICESTERUK
TSUNEO KIIISASJAPAN
TAKAYA OHASHITOKYO METRO UNIVJAPAN

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
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