XMM-Newton Observations of Luminous Narrow-Line Seyfert 1 Galaxies
XMM-Newton Observations of Luminous Narrow-Line Seyfert 1 Galaxies
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DOI：
10.1143/ptps.155.377
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发表时间：
2004-05
影响因子：
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通讯作者：
C. Matsumoto;K. Leighly;T. Kawaguchi
中科院分区：
文献类型：
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作者：
C. Matsumoto;K. Leighly;T. Kawaguchi
利用XMM-牛顿观测了4个光学发光的窄线Seyfert 1星系（NLS 1）。所有4个NLS 1均被检测到。观察到的X射线光谱相当陡峭（r = 2-3），这在NLS 1中是典型的。利用同时紫外观测的XMM-牛顿光学监测器（OM），我们还调查了光谱能量分布在UV-X-射线波段。在我们的观测中，发现四个天体中的一个（RX J1225.7+2055）是X射线弱的（α o x <$2.0）。从较大的NLS 1 s中编译α OX的值，我们发现，尽管样本很小，但α OX分布表明，X射线弱可能在更明亮的NLS 1 s中更频繁地发生。
We observed four optically-luminous narrow-line Seyfert 1 galaxies (NLS1s) with XMM-Newton. All the four NLS1s were detected. The observed X-ray spectra were rather steep (Γ = 2-3), as is typical among NLS1s. Utilizing simultaneous UV observations by the XMM-Newton optical monitor (OM), we also investigate the spectral energy distributions in the UV-X-ray band. One object (RX J1225.7+2055) of the four was found to be X-ray weak (α o x ∼2.0) during our observations. Compiling values of α O X from a larger NLS1s, we find that, although the sample is small, the α O X distribution suggests that X-ray weakness may occur more frequently among more luminous NLS1s.