SUMMARY OF PROPOSAL 72157
SMITHSONIAN ASTROPHYSICAL OBSERVATORY
60, GARDEN ST.
MA USA 02138
Tel: (617)495-7442 Fax: (617)495-7356
Medium: CD ROM
REDSHIFTED FE-K LINES & COMPTON HUMPS: IONIZED DISK DIAGNOSTICS
ABSTRACTBy 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-I NAME ||INSTITUTE ||COUNTRY |
| GIORGIO MATT||UNIV. DI ROMA||ITALY|
| ANETA SIEMIGINOWSKA||CFA||USA|
| JONATHAN MCDOWELL||CFA||USA|
| JILL BECHTOLD||U. ARIZONA, TUCSON||USA|
| FABRIZIO FIORE||CFA||USA|
|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|