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HD 179504


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The emission spectrum of active galactic nuclei. II - High column density photoionization models and low ionization lines
Current one-component models of the broad line region of quasars fail toexplain the strength of low ionization lines. A two-componentphotoionization model where the high and low ionization lines areallowed to arise from different kinds of clouds is explored. A spectraldistribution of the incident radiation which tends to overestimate theX-ray flux around 3 keV is adopted in order to enhance the extent andthe heating of the excited H I region. After discussing the influence ofseveral parameters, it is concluded that the model is still unable toexplain the observed ratio Fe II/H? and that another kind of cloud,presumably not heated by photoionization, is needed to emit Fe II.

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观测天体数据

星座:望遠鏡座
右阿森松:19h15m43.94s
赤纬:-53°51'42.2"
视星:8.91
距离:117.925 天文距离
右阿森松适当运动:30.8
赤纬适当运动:-96.1
B-T magnitude:9.4
V-T magnitude:8.951

目录:
适当名称   (Edit)
HD 1989HD 179504
TYCHO-2 2000TYC 8760-802-1
USNO-A2.0USNO-A2 0300-35546305
HIPHIP 94660

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