SUMMARY OF PROPOSAL 72157
SMITHSONIAN ASTROPHYSICAL OBSERVATORY
60, GARDEN ST.
CAMBRIDGE
MA USA 02138
Tel: (617)495-7442 Fax: (617)495-7356
Medium: CD ROM
Subject: AGN
REDSHIFTED FE-K LINES & COMPTON HUMPS: IONIZED DISK DIAGNOSTICS
ABSTRACT
By observing the bright radio-quiet z=1.25 quasar Q0140-3938 we propose to test the X-ray `Baldwin effect': that the relativistically broadened Fe-K line becomes weaker as AGN become more luminous. This needs to be done with radio-quiet quasars to avoid beaming dilution. We will also test the proposed explanation of this effect: that the accretion disk becomes fully ionized. This can be done by measuring the Compton hump relative to the Fe-K line, since Compton scattering operates independent of ionization. To measure the Compton hump with ASCA requires z>1. Q0140-3938 is the only radio-quiet quasar with a high enough ASCA count rate to give strong limits (EW<30eV; Omega/2pi<0.2).
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| SMITA MATHUR | CFA | USA |
| GIORGIO MATT | UNIV. DI ROMA | ITALY |
| ANETA SIEMIGINOWSKA | CFA | USA |
| JONATHAN MCDOWELL | CFA | USA |
| JILL BECHTOLD | U. ARIZONA, TUCSON | USA |
| FABRIZIO FIORE | CFA | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)Q0140-3938 | A | 26.5525 | -39.3847 | 100 ks | N | N | P | 0.23400 | 1 |