Revealing the Active Galactic Nucleus in the Superantennae through L-Band Spectroscopy
Revealing the Active Galactic Nucleus in the Superantennae through L-Band Spectroscopy
复制标题
通过 L 波段光谱揭示超级天线中的活动星系核
DOI：
10.1086/378842
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
M. Salvati
中科院分区：
文献类型：
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作者：
G. Risaliti;G. Risaliti;R. Maiolino;A. Marconi;L. Bassani;S. Berta;V. Braito;V. Braito;R. D. Ceca;A. Franceschini;M. Salvati
我们提出了一个超亮红外星系IRAS 19254-7245（超天线）的L波段光谱，获得了红外光谱仪和阵列相机的甚大望远镜。高信噪比使我们能够以前所未有的细节研究河外源的主要光谱特征。我们认为，在红外线的主要能源是一个模糊的活动星系核。3.3 μm多环芳烃特征的低等效宽度、3.4 μm处的宽吸收特征和λ > 3.7 μm处的陡峭连续谱（fλ <$λ2.7）表明了这一点。3.4 μm吸收特征的亚结构表明，吸收是由于6至7个碳原子的烃链。
We present an L-band spectrum of the ultraluminous infrared galaxy IRAS 19254-7245 (the Superantennae), obtained with the Infrared Spectrometer and Array Camera on the Very Large Telescope. The high signal-to-noise ratio allows us to study the main spectral features with unprecedented detail for an extragalactic source. We argue that the main energy source in the IR is an obscured active galactic nucleus. This is indicated by the low equivalent width of the 3.3 μm polycyclic aromatic hydrocarbon feature, the broad absorption feature at 3.4 μm, and the steep continuum at λ > 3.7 μm (fλ ∝ λ2.7). The substructure of the 3.4 μm absorption feature indicates that the absorption is due to hydrocarbon chains of six to seven carbon atoms.