标题： 通过3-5微米光谱揭示的NGC 6240中的双重活动星系核 (AGN) 显示英文标题

标题： The double AGN in NGC 6240 revealed through 3-5 micron spectroscopy

摘要： 我们展示了对相互作用系统NGC 6240的3-5微米光谱观测，显示了两个活动星系核的存在。 最亮（南部）的星系核表现出类似恒星爆发的发射特征，并具有显著的3.3微米发射特征。 然而，一个宽达~1800公里/秒的Brα发射线的探测揭示了活动星系核的存在。 最暗弱（北部）星系核的光谱显示出典型的活动星系核特征，如陡峭的连续谱和M波段中的宽吸收特征。 我们讨论了尘埃吸收/发射体的物理性质，并表明在这两个核区，活动星系核在3-5微米波段占主导地位，但其对总亮度的贡献很小（仅为恒星爆发发光的百分之几）。 显示英文摘要

摘要： We present 3-5 micron spectroscopy of the interacting system NGC 6240, showing the presence of two active galactic nuclei. The brightest (southern) nucleus shows up with a starburst-like emission, with a prominent 3.3 micron emission feature. However, the presence of an AGN is revealed by the detection of a broad Br alpha emission line, with a width of ~1,800 km/s. 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 show that in both nuclei the AGN is dominant in the 3-5 micron band, but its contribution to the total luminosity is small (a few percent of the starburst emission).