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THE DOUBLE ACTIVE GALACTIC NUCLEUS IN NGC 6240 REVEALED THROUGH 3-5 μm SPECTROSCOPY

机译:通过3-5μm光谱显示了NGC 6240中的双活性银河系核

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摘要

We present 3-5 μm spectroscopy of the interacting system NGC 6240, revealing the presence of two active galactic nuclei (AGNs). The brightest (southern) nucleus shows up with a starburst-like emission, with a prominent 3.3 μm emission feature. However, the presence of an AGN is revealed by the detection of a broad Brα emission line, with a width of ~1800 km s~(-1). The spectrum of the faintest (northern) nucleus shows typical AGN features, such as a steep continuum and broad absorption features in the M band. We discuss the physical properties of the dusty absorbers/emitters, and we show that in both nuclei, the AGN is dominant in the 3-5 μm band but that its contribution to the total luminosity is small (a few percent of the starburst emission).
机译:我们目前的相互作用系统NGC 6240的3-5μm光谱,揭示了两个活跃的银河核(AGNs)的存在。最明亮的(南部)原子核呈星状爆发,并具有明显的3.3μm发射特征。然而,通过检测一条宽〜1800 km s〜(-1)的宽Brα发射线可以发现AGN的存在。最微弱的(北)原子核的光谱显示出典型的AGN特征,例如M波段中陡峭的连续谱和宽吸收特征。我们讨论了粉尘状吸收体/发射体的物理性质,结果表明,在两个核中,AGN在3-5μm波段均占主导,但对总光度的贡献很小(占星爆发射的百分之几) 。

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