Testing current synthesis models of the X-ray background
Testing current synthesis models of the X-ray background
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测试 X 射线背景的当前合成模型
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
G. Hasinger
中科院分区：
文献类型：
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作者：
R. Gilli;M. Salvati;G. Hasinger
我们提出了合成模型的X射线背景下，可用的X射线观测约束条件来获得信息的活动星系核的人口属性。我们需要发光的X射线吸收活动星系核，类星体，在再现2-10千电子伏的源计数在相对明亮的通量。我们比较了一个模型，吸收的活动星系核的演化速度比未吸收的，与标准模型，吸收和未吸收的活动星系核以相同的速度发展。结果表明，当吸收和未吸收活动星系核的比值从z=0增加到z~1.3时，其数值描述将得到显著的改善。最后，我们对深X射线巡天中观测到的活动星系核做出了预测，其中包含了活动星系核在高红移处的空间密度信息。
We present synthesis models of the X-ray background where the available X-ray observational constraints are used to derive information on the AGN population properties. We show the need for luminous X-ray absorbed AGNs, the QSO2s, in reproducing the 2-10 keV source counts at relatively bright fluxes. We compare a model where the evolution of absorbed AGNs is faster than that of unabsorbed ones, with a standard model where absorbed and unabsorbed AGNs evolve at the same rate. It is found that an increase by a factor of ~2 from z=0 to z~1.3 in the ratio between absorbed and unabsorbed AGNs would provide a significant improvement in the data description. Finally, we make predictions on the AGNs to be observed in deep X-ray surveys which contain information on the AGN space density at high redshift.