Extragalactic Astronomy with IR Arrays

“金地鼠”是一种中红外二维成像仪器，于1989年完成。焦平面采用航空喷气电子系统事业部制造的20X64单元As:Si阵列，板比例尺为0.83弧秒/像素。目前，Golden- Gopher在8.5微米、1微米带宽、30分钟的源上集成中，在3毫微米/像素的通量密度下实现了信噪比= 1。光学设计包括一个光谱选项，在R=100，通过旋转一个平面反射镜，有一个光栅背对背。旋转轴承机制的问题阻碍了在光谱模式下的观测。在接下来的一年里，“金地鼠”将被修改以进行常规的光谱观测，例如星系核硅酸盐特征的长缝光谱、8.7和11.3微米的“多环芳烃”波段以及ıAr III！， ıS IV)和ıNe II！行。成像光谱观测将用于广泛的星系，包括来自IRAS明亮星系样本的系统。这些数据将提供有关核区的形态和放射尘埃和电离气体的物理范围的信息。这样的测量将允许对由于未解决的活动核而不是恒星形成区域而产生的通量的比例施加新的限制。

The "Golden-Gopher", a mid-infrared, 2-dimensional imaging instrument was completed in 1989. The focal plane uses a 20X64 element As:Si array manufactured by Aerojet Electronic Systems Division with a plate scale of 0.83 arcsec/pixel. The Golden- Gopher currently achieves SNR = 1 at a flux density of 3 mJy/pixel in 30 minutes of on-source integration at 8.5 micrometer with a 1 micrometer bandwidth. The optical design includes a spectroscopic option at R=100 by rotating a plane mirror which has a grating back-to-back. Problems with the rotation bearing mechanism have prevented observations in the spectroscopic mode. In the coming year the Golden-Gopher will be modified to enable routine spectroscopic observations, e.g. long slit spectra of the silicate feature of galactic nuclei and the 8.7 and 11.3 micrometer "PAH" bands as well as the ıAr III!, ıS IV) and ıNe II! lines. Imaging spectroscopic observations are to be made of a wide range of galaxies, including systems from the IRAS bright galaxy sample. These data will give information on the morphology of the nuclear region and the physical extent of the emitting dust and ionized gas. Such measurements will allow new limits to be placed on the proportion of flux due to unresolved active nuclei as opposed to regions of star formation.