X-ray spectra of XMM-Newton serendipitous medium flux sources
X-ray spectra of XMM-Newton serendipitous medium flux sources
复制标题
XMM-牛顿偶然介质通量源的 X 射线谱
DOI：
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发表时间：
2004
期刊：
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通讯作者：
M. Watson
中科院分区：
文献类型：
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作者：
S. Mateos;X. Barcons;F. Carrera;M. Ceballos;A. Caccianiga;G. Lamer;T. Maccacaro;M. Page;A. Schwope;M. Watson
我们报告的一个大样本的X射线光谱特性的详细分析的结果，偶然发现的XMM-牛顿天文台在25个选定的领域，光学鉴定正在进行中。这次巡天覆盖的总立体角为3.5 deg 2，包含1137个能量为1010 −15 10 43 erg s −1的源，因此被归类为2型活动星系核（AGN）的比例明显更高（40%），并有适度高柱的暗示。在修正吸收后，我们没有发现BLAGN的基本幂律指数红移演化的证据，它大致保持在Γ = 1.9，固有色散为0.4。BLAGN和NELG中的一小部分（约7%）需要软过量的存在，我们将其建模为温度范围为0.1至0.3 keV的黑体。将我们的吸收结果与流行的X射线背景合成模型进行比较，我们发现吸收仅占预期来源的40%。这是由于与模型相比，我们的样品中缺少大量吸收源（NH = 10 22 −10 24 cm −2）。因此，我们的结论是，合成模型需要在其特定的参数进行一些修改。
We report on the results of a detailed analysis of the X-ray spectral properties of a large sample of sources detected serendipitously with the XMM-Newton observatory in 25 selected fields, for which optical identification is in progress. The survey covers a total solid angle of ∼3.5 deg 2 and contains 1137 sources with ∼10 −15 10 43 erg s −1 , and therefore classified as type 2 AGNs) is significantly higher (40%), with a hint of moderately higher columns. After correcting for absorption, we do not find evidence for a redshift evolution of the underlying power law index of BLAGNs, which stays roughly constant at Γ ∼ 1.9, with intrinsic dispersion of 0.4. A small fraction (∼7%) of BLAGNs and NELGs require the presence of a soft excess, that we model as a black body with temperature ranging from 0.1 to 0.3 keV. Comparing our results on absorption to popular X-ray background synthesis models, we find absorption in only ∼40% of the sources expected. This is due to a deficiency of heavily absorbed sources (with NH ∼ 10 22 −10 24 cm −2 ) in our sample in comparison with the models. We therefore conclude that the synthesis models require some revision in their specific parameters.