SUMMARY OF PROPOSAL 53020

DR. ANDREA COMASTRI
COMASTRI@ASTBO3.BO.ASTRO.IT

OSSERVATORIO ASTRONOMICO DI BOLOGNA
ITALY I-40126
BOLOGNA
VIA ZAMBONI 33
Tel: +39-51-259419 Fax: +39-51-259407
Medium: 4GBDAT
Subject: AGN

X-RAY SPECTRA OF HIGH REDSHIFT (Z > 2) RADIO-QUIET QUASARS


ABSTRACT

Recent ROSAT and ASCA observations of a sizeable sample of high-redshift radio-loud quasars have revealed that substantial intrinsic absorption is a common property suggesting a different beahviour among low and high redshift objects. On the other side, the spectral information available for radio-quiet quasars is almost absent. The proposed observations of 2 high-redshift radio-quiet quasars will allow us to obtain broad band (1-30 keV in the source rest frame) X-ray spectra of good statistical quality. The comparison with the available data for low redshift objects will provide new constraints on the quasar emission mechanism and evolutive properties. This proposal follows a previous succesful one (AO-4) and is part of a more general program we have in common with our RIKEN colleagues.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
MASSIMO CAPPIITESRE/CNRITALY
CRISTIAN VIGNALIBOLOGNA UNIVERSITYITALY
GIOVANNI ZAMORANIOSS. ASTR. BOLOGNAITALY
MASARU MATSUOKARIKENJAPAN
SILVANO MOLENDIIFCTR/CNR MILANOITALY

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)WEE 83
1
194.5375 35.3303 40 ksN
Y
P
0.04000
1
2)C25.36
1
45.4821-43.5139 40 ksN
Y
P
0.03000
1