Atlas of quasar energy distributions
Atlas of quasar energy distributions
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DOI：
10.1086/192093
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发表时间：
1994-11
影响因子：
8.7
通讯作者：
M. Elvis;B. Wilkes;J. McDowell;R. Green;J. Bechtold;S. Willner;M. S. Oey;E. Polomski;R. Cutri-R.
中科院分区：
文献类型：
--
作者：
M. Elvis;B. Wilkes;J. McDowell;R. Green;J. Bechtold;S. Willner;M. S. Oey;E. Polomski;R. Cutri-R.
我们给出了正常、非blazar类星体在整个电磁光谱可用范围(射电到10keV X射线)上的光谱能量分布(SED)图谱。原始(UVSX)样本包括47个类星体，其光谱能量分布包括X射线光谱指数和紫外线数据。在这些广播中，29个是静音广播，18个是大声广播。SED以图表和表格的形式列出，并在CD-ROM上出版了额外的表格材料。先前未发表的第二组类星体的观测数据也被列在了表格中。考虑了宿主星系星光污染和前景消光对UVSX样本的影响，并利用该样本研究了SED性质的范围。当然，我们得到的性质受到类星体发现技术所产生的选择效应的强烈影响。我们推导了射电噪声和射电安静物体的平均能量分布，并给出了由此得到的辐射热校正值。然而，我们注意到，这个平均值的色散是很大的(当MED在近红外拐点被归一化时，红外和紫外线分量大约都是十年)。紫外线中的色散至少有一部分可能是由于时间的可变性，但这在红外中不太可能是重要的。如此大的色散的存在表明，MED只反映了类星体的一些性质，因此应该谨慎使用。
We present an atlas of the spectral energy distributions (SEDs) of normal, nonblazar, quasars over the whole available range (radio to 10 keV X-rays) of the electromagnetic spectrum. The primary (UVSX) sample includes 47 quasars for which the spectral energy distributions include X-ray spectral indices and UV data. Of these, 29 are radio quiet, and 18 are radio loud. The SEDs are presented both in figures and in tabular form, with additional tabular material published on CD-ROM. Previously unpublished observational data for a second set of quasars excluded from the primary sample are also tabulated. The effects of host galaxy starlight contamination and foreground extinction on the UVSX sample are considered and the sample is used to investigate the range of SED properties. Of course, the properties we derive are influenced strongly by the selection effects induced by quasar discovery techniques. We derive the mean energy distribution (MED) for radio-loud and radio-quiet objects and present the bolometric corrections derived from it. We note, however, that the dispersion about this mean is large (approximately one decade for both the infrared and ultraviolet components when the MED is normalized at the near-infrared inflection). At least part of the dispersion in the ultraviolet may be due to time variability, but this is unlikely to be important in the infrared. The existence of such a large dispersion indicates that the MED reflects only some of the properties of quasars and so should be used only with caution.