THE CENTRAL ENGINES OF TWO UNUSUAL RADIO-INTERMEDIATE/QUIET ACTIVE GALACTIC NUCLEI: III Zw 2 AND PG 1407+265
THE CENTRAL ENGINES OF TWO UNUSUAL RADIO-INTERMEDIATE/QUIET ACTIVE GALACTIC NUCLEI: III Zw 2 AND PG 1407+265
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DOI：
10.1088/0004-637x/748/2/119
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
L. Chen;Xinwu Cao;J. Bai
中科院分区：
文献类型：
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作者：
L. Chen;Xinwu Cao;J. Bai
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/紫外发射可能主要是吸积盘的发射。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中的光学/紫外成分可以很好地模拟为吸积盘的辐射，而红外成分则归因于尘埃环的热辐射，其张角为1.50 °。如果X射线连续辐射是由喷流的同步辐射所支配，那么源应该是一个“高峰频率耀变体”，这明显偏离了正常的耀变体序列。用粘性参数α = 0.5的吸积盘/日冕模型也能很好地拟合所观测到的SED。PG 1407+265吸积盘/日冕的光谱满足Laor & Davis提出的弱线类星体判据。
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 of ∼50°. 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 from the normal blazar sequence. The observed SED can also be fitted quite well by the accretion disk/corona model with the viscosity parameter α = 0.5. The spectrum of the accretion disk/corona in PG 1407+265 satisfies the weak-line quasar criterion suggested in Laor & Davis.