IRAS镓酸盐的OAO/ISLE近红外光谱
OAO/ISLE Near-IR Spectroscopy of IRAS Galaxies
摘要：
利用冈山天文台1.88 m望远镜上的ISLE成像仪和摄谱仪对9个IRAS星系（NGC 1266，NGC 1320，NGC 2633，NGC 2903，NGC 3034，Mrk 33，NGC 7331，NGC 7625，NGC 7714）进行了近红外光谱研究。[Fe在整个样品中观测到了1.257 μ m和Pa β发射线，另外还观测到了H2 2.121 μ m和Br γ发射线，其通量比可作为诊断星系主导能量源的工具。我们发现NGC 1266的核很可能是一个低电离核发射线区，而NGC 2633和NGC 2903可能含有活动星系核。没有发现其他天体的活动星系核或线性星云信号。此外，我们发现的光谱特征，这是指示一些不寻常的现象发生在星系中，如大[Fe II]线宽度相比，本地逃逸速度在NGC 1266。目前的工作显示了ISLE的潜在能力，通过对星系的统计调查或对单个物体中发现的光谱特征的探索，揭示了红外星系的性质。
英文摘要：
We present the results of the near-infrared (IR) spectroscopy of nine IRAS galaxies (NGC 1266, NGC 1320, NGC 2633, NGC 2903, NGC 3034, Mrk 33, NGC 7331, NGC 7625, NGC 7714) with the ISLE imager and spectrograph mounted on the Okayama Astrophysical Observatory 1.88 m telescope. [Fe II] 1.257 um and Pa beta emission lines were observed for the whole sample while H2 2.121 um and Br gamma lines were additionally obtained for two sources, whose flux ratios are used as a diagnostic tool of dominant energy sources of the galaxies. We find that the nucleus of NGC 1266 is most likely a low ionization nuclear emission-line region (LINER), while NGC 2633 and NGC 2903 possibly harbor active galactic nuclei (AGNs). No AGN or LINER signal is found for other objects. In addition, we find the spectral features which is indicative of some unusual phenomena occurring in the galaxies, such as the large [Fe II] line widths compared to the local escape velocity in NGC 1266. The present work shows the potential ability of the ISLE to shed new light on the nature of infrared galaxies, either through a statistical survey of galaxies or an exploration of spectral features found in individual objects.
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