Mimir: A Near-Infrared Wide-Field Imager, Spectrometer, and Polarimeter
Mimir: A Near-Infrared Wide-Field Imager, Spectrometer, and Polarimeter
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Mimir：近红外宽场成像仪、光谱仪和旋光仪
DOI：
10.1086/524775
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发表时间：
2007
影响因子：
3.5
通讯作者：
B. Taylor
中科院分区：
文献类型：
--
作者：
D. Clemens;D. Sarcia;A. Grabau;E. Tollestrup;M. Buie;E. Dunham;B. Taylor
Mimir是一个新的设施级近红外仪器，用于亚利桑那州弗拉格斯塔夫外安德森梅萨的1.8米帕金斯望远镜，已投入使用，并已运行三年。Mimir是多功能的，执行宽场（F/5）和窄场（F/17）成像，长缝光谱和成像偏振。F/5模式以每像素0.59″成像到1024 × 1024像素的ALADDIN III InSb阵列探测器上，提供10′ × 10′视场。在F/17模式下，底片比例为每像素0.18″。在光学上，Mimir是F/17.5 Perkins光束的折射再成像仪。六透镜准直器产生消色差的25 mm瞳孔，其由五透镜相机（F/5）、四透镜相机（F/17）或双透镜瞳孔观察器成像到检测器上。三个滤光轮在瞳孔之前，一个在瞳孔之后。轮包含一个旋转半波片，宽带滤波器，窄带滤波器，光栅，长通滤波器，线栅，和热红外阻断器。第一个望远镜焦点位于Mimir内，由两辆线性运动汽车组成的狭缝和德克尔单元从13个狭缝场景中选择一个。狭缝和德克尔汽车、四个滤光轮、半波片旋转和相机选择器都由冷真空空间内的步进电机驱动。冷却由CTI 1050两级闭合循环氦制冷机提供，使光学器件、滤光片和内表面保持在65至75 K之间，探测器保持在33.5 K。Mimir的不同模式之间的切换只需几秒钟，使其成为一种多功能工具，可进行广泛的调查并对不断变化的观察条件做出快速反应。帕金斯望远镜上的Mimir成像灵敏度比2 MASS深2-4等，几乎任何2 MASS源的中等分辨率（R 700）JHK光谱，高精度宽视场成像偏振测量，以及L′和M′波段成像和光谱学。
Mimir, a new facility-class near-infrared instrument for the 1.8 m Perkins telescope on Anderson Mesa outside Flagstaff, Arizona, was commissioned and has been operating for three years. Mimir is multifunction, performing wide-field (F/5) and narrow-field (F/17) imaging, long-slit spectroscopy, and imaging polarimetry. The F/5 mode images at 0.59″ per pixel onto the 1024 × 1024 pixel ALADDIN III InSb array detector, giving a 10′ × 10′ field of view. In the F/17 mode, the plate scale is 0.18″ per pixel. Optically, Mimir is a refractive reimager for the F/17.5 Perkins beam. A six-lens collimator produces an achromatic 25 mm pupil, which is imaged by a five-lens camera (F/5), a four-lens camera (F/17), or a two-lens pupil viewer onto the detector. Three filter wheels precede the pupil, one follows the pupil. The wheels contain a rotating half-wave plate, broadband filters, narrowband filters, grisms, long-pass filters, a wire grid, and thermal IR blockers. The first telescope focus is within Mimir, where a slit and decker unit, consisting of two linear motion cars, selects one of 13 slit scenes. The slit and decker cars, the four filter wheels, the half-wave plate rotation, and the camera selector are all driven by stepper motors within the cold vacuum space. Cooling is provided by a CTI 1050 two-stage, closed-cycle helium refrigerator, keeping the optics, filters, and internal surfaces between 65 and 75 K and the detector at 33.5 K. Switching between Mimir’s different modes takes only a few seconds, making it a versatile tool for conducting a wide range of investigations and for quickly reacting to changing observing conditions. Mimir on the Perkins telescope achieves imaging sensitivities 2–4 mag deeper than 2MASS, moderate resolution (R ∼ 700) JHK spectra of virtually any 2MASS source, high-precision wide-field imaging polarimetry, and L′ and M′ band imaging and spectroscopy.