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arXiv 1201.4435astro-ph.HEastro-ph.CO
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III Zw 2和PG 1407+265两个不寻常的射电中等/宁静活动星系核的中心引擎

The central engines of two unusual radio-intermediate/quiet active galactic nuclei: III Zw 2 and PG 1407+265

Liang Chen, Xinwu Cao, Jinming Bai

摘要:

利用吸积盘/日冕+喷流模型拟合了两个异常射电中等/宁静类星体的多波段光谱能量分布。发现III Zw 2的光/紫外辐射可能主要由吸积盘的辐射所控制。X射线辐射主要来自喷流,而盘状日冕的贡献可以忽略不计。PG 1407+265的SED中的光/紫外成分可以很好地模拟为来自吸积盘的辐射,而红外成分则归因于来自尘埃环的热辐射,其张角约为50 \circ。如果X射线连续辐射以喷流的同步辐射为主,则该源应是一个“高峰值频率耀变体”,这明显偏离了正常耀变体序列。所观察到的SED也可以很好地拟合的吸积盘/日冕模型的粘度参数?= 0:5。PG 1407+265的吸积盘/日冕光谱满足Laor & Davis提出的弱线类星体判据。

英文摘要:

We use the accretion disk/corona+jet model to fit the multi-band spectral energy distributions (SEDs) of two unusual radio-intermediate/quiet quasars. It is found that the optical/UV emission of III Zw 2 is probably dominated by the emission from the accretion disk. The X-ray emission should be dominated by the radiation from the jet, while the contribution of the disk corona is negligible. The optical/UV component in the SED of PG 1407+265 can be well modeled as the emission from the accretion disk, while the IR component is attributed to the thermal radiation from the dust torus with an opening angle ~ 50\circ. If the X-ray continuum emission is dominated by the synchrotron emission of the jet, the source should be a "high peak frequency blazar", which obviously deviates the normal blazar sequence. The observed SED can also be fitted quite well by the accretion disk/corona model with the viscosity parameter ? = 0:5. The spectrum of the accretion disk/corona in PG 1407+265 satisfies the weak line quasar criterion suggested in Laor & Davis.

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