BeppoSAX observations of quasars

被引：0
|
作者：
Fiore, F [1 ]
Mineo, T [1 ]
Laor, A [1 ]
Giallongo, E [1 ]
机构：
[1] BeppoSAX Sci Data Ctr, I-00131 Rome, Italy
来源：
ACTIVE X-RAY SKY: RESULTS FROM BEPPOSAX AND RXTE | 1998年
关键词：
D O I：
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present results from recent BeppoSAX observations of low redshift (z<0.4, Po sample) and high redshift (2<z<4.5) radio-quiet and radio-loud quasars. Significant curvature has been detected in the spectra of the observed PGs: the spectrum flattens by 0.5 above 2 keV. The possible presence of narrow features in the MECS spectra is discussed. Intrinsic absorption has been measured in the z=3.9 radio-loud quasar 1745+624. The z=2.3 radio-quiet quasar HE1104-1805 has been found at a very low flux level, in comparison with previous ROSAT and ASCA observations, implying large (factor of similar to 4) variability on years timescales.
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页码：529 / 532
页数：4
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