Extended emission-line regions in low-redshift quasars - Dependence on nuclear spectral properties
Extended emission-line regions in low-redshift quasars - Dependence on nuclear spectral properties
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DOI：
10.1051/0004-6361:200810276
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发表时间：
2008-07
影响因子：
6.5
通讯作者：
B. Husemann;L. Wisotzki;S. Sánchez;K. Jahnke
中科院分区：
文献类型：
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作者：
B. Husemann;L. Wisotzki;S. Sánchez;K. Jahnke
目标。我们寻找存在的扩展发射线区域（EELRs）周围的低红移类星体。方法.我们观测了20个射电宁静低红移类星体（z 50）的核谱，测量了它们的[$\ion{O}{iii}$]/H β通量比、$\ion{Fe}{ii}$等效宽度和H β线宽等性质。结果相当一部分类星体（8/20）显示出明亮的EELR，检测到的线性尺寸为几kpc。类星体是否具有发光的EELR与核性质密切相关，在这个意义上，EELR是在具有低的$\ion{Fe}{ii}$等效宽度和大的H β ${\it FWHM}$的物体中检测到的。EELR在黑洞质量较大的类星体中优先被探测到。然而，EELR探测与类星体光度和爱丁顿比之间没有明显的关系。
Aims. We searched for the presence of extended emission-line regions (EELRs) around low-redshift QSOs. Methods. We observed a sample of 20 mainly radio-quiet low-redshift quasars ($z 50) nuclear spectra to measure properties such as [$\ion{O}{iii}$]/H β flux ratios, $\ion{Fe}{ii}$ equivalent widths and H β line widths. Results. A significant fraction of the quasars (8/20) show a luminous EELR, with detected linear sizes of several kpc. Whether or not a QSO has a luminous EELR is strongly related with nuclear properties, in the sense that an EELR was detected in objects with low $\ion{Fe}{ii}$ equivalent width and large H β ${\it FWHM}$. The EELRs were detected preferentially in QSOs with larger black hole masses. There is no discernible relation, however, between EELR detection and QSO luminosity and Eddington ratio.