The X-Ray Properties of z > 4 Quasars
The X-Ray Properties of z > 4 Quasars
复制标题
z > 4 类星体的 X 射线特性
DOI：
10.1086/301362
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
D. Schneider
中科院分区：
文献类型：
--
作者：
S. Kaspi;W. Brandt;D. Schneider
我们报告的搜索X射线发射的类星体的红移大于4使用ROSAT公共数据库。我们的搜索使X射线检测到的z > 4类星体的数量增加了一倍，从6个增加到12个。在这项工作之前，大多数已知的类星体都是无线电噪声和X射线选择源;我们的研究将X射线检测到的光学选择z > 4类星体的数量从1增加到7。我们介绍了它们的基本X射线性质，并与低红移类星体的X射线性质进行了比较。我们没有发现任何证据表明光学选择z > 4的类星体和那些红移较低的类星体之间有很强的宽带光谱差异。
We report on a search for X-ray emission from quasars with redshifts greater than 4 using the ROSAT public database. Our search has doubled the number of z > 4 quasars detected in X-rays from six to 12. Most of those known prior to this work were radio-loud and X-ray–selected sources; our study increases the number of X-ray–detected, optically selected z > 4 quasars from one to seven. We present their basic X-ray properties and compare these with those of lower redshift quasars. We do not find any evidence for strong broadband spectral differences between optically selected z > 4 quasars and those at lower redshifts.