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Statistics of the Big Blue Bump Feature in a Low Redshift Sample of Active Galactic Nuclei

机译：活动银河系核的低红移样本中大蓝凸特征的统计

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摘要

We present a statistical analysis of the big blue bump (BBB) feature for a large heterogeneous sample of 95 optically selected and soft X-ray bright, low redshift active galactic nuclei (AGNs). This sample covers a sufficiently broad luminosity range, allowing us to test the luminosity dependence of the spectral energy distribution in the BBB region. Following the works of Zheng et al., Laor et al. and Kriss et al., we introduce the broad band spectral index from 1050 Å to0.5 keV (α UV-SX ), compare its distribution with that of the soft X-ray spectral index (α SX ) obtained by ROSAT PSPC, and find that the two indices have equal average-values within 1 ∼ 2σuncertainties, whether in the whole sample, in luminosity divisions or in subsamples. These equalities also have no obvious luminosity dependence. This indicates that a single power law can describe the overall UV toX-ray spectrum in a statistical sense, or the broad band UV to soft X-ray spectrum is the soft X-ray spectral extension on an average. Thus, our results support Laor et al.'s conjecture about the BBB peak aroundFUV 1050 Å from a statistical viewpoint. As we further test whether the equality holds for individual objects within measure errors, χ2 test refuse to accept it. In addition, our statistical results, from the luminosity divisions and on the correlation of spectral indices with luminosity (M B), imply that the luminosity dependence of α UV and α UV-SX is mainly due to absorption in low luminosity AGNs.
机译：我们为95个光学选择的和软的X射线明亮，低红移活性银河核（AGN）的大型异质样本提供了大蓝点（BBB）功能的统计分析。该样品涵盖了足够宽的发光度范围，使我们能够测试BBB区域中光谱能量分布的发光度依赖性。继Zheng等人的工作之后，Laor等人的工作也得以完成。和Kriss等人，我们介绍了1050Å至0.5 keV的宽带光谱指数（αUV-SX ），并将其分布与软X射线光谱指数（αSX >）由ROSAT PSPC获得，发现无论在整个样本中，在光度划分中还是在子样本中，两个指数的平均值均在1-2σ不确定度之内。这些等式也没有明显的光度依赖性。这表明单个幂定律可以从统计意义上描述整个UV to X射线光谱，或者宽带UV到soft X射线光谱是平均而言soft X射线光谱的扩展。因此，从统计学的观点来看，我们的结果支持Laor等人关于FUV 1050Å附近的BBB峰的推测。当我们进一步测试等式是否适用于度量误差内的单个对象时，χ2测试拒绝接受它。此外，我们从亮度分区以及光谱指数与亮度（MB ）的相关性得出的统计结果表明，αUV 和αUV-SX 的亮度依赖性为主要是由于在低亮度AGN中的吸收。

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  • 来源
    《Astrophysics and Space Science》 |2002年第3期|301-316|共16页
  • 作者

    Shuang-An Huang; You-Yuan Zhou; Ting-Gui Wang;

  • 作者单位

    Center for Astrophysics University of Science and Technology of China;

    Center for Astrophysics University of Science and Technology of ChinaNational Astronomical Observatories Chinese Academy of ScienceBeijing Jointly Astrophysical Center Beijing University;

    Center for Astrophysics University of Science and Technology of ChinaNational Astronomical Observatories Chinese Academy of ScienceBeijing Jointly Astrophysical Center Beijing University;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Galaxies: Active Galactic Nuclei; Galaxies: Quasar; X-rays: Galaxies;

    机译：星系：活跃的银河核;星系：类星体;X射线：星系;

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