The University of Tokyo Atacama Observatory 6.5m telescope: On-sky performance evaluations of the mid-infrared instrument MIMIZUKU on the Subaru telescope
The University of Tokyo Atacama Observatory 6.5m telescope: On-sky performance evaluations of the mid-infrared instrument MIMIZUKU on the Subaru telescope
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东京大学阿塔卡马天文台6.5m望远镜：斯巴鲁望远镜上的中红外仪器MIMIZUKU的空中性能评估
DOI：
10.1117/12.2560789
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Y. Yoshii
中科院分区：
文献类型：
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作者：
T. Kamizuka;T. Miyata;S. Sako;R. Ohsawa;K. Asano;M. Uchiyama;T. Mori;Yutaka Yoshida;Kengo Tachibana;Tsubasa Michifuji;M. Uchiyama;I. Sakon;T. Onaka;H. Kataza;T. Aoki;M. Doi;B. Hatsukade;N. Kato;K. Kohno;M. Konishi;T. Minezaki;T. Morokuma;Mizuki Numata;K. Motohara;H. Sameshima;T. Soyano;H. Takahashi;T. Tanabé;Masuo Tanaka;K. Tarusawa;S. Koshida;Y. Tamura;Y. Terao;Kosuke Kushibiki;Hiroki Nakamura;Y. Yoshii
用于凝视未知宇宙的中红外多场成像仪(MIMIZUKU)是东京大学阿塔卡马天文台(TAO)6.5米望远镜的第一代中红外成像仪。MIMIZUKU在2-38微米范围内执行中波段成像和低分辨率光谱，并在超过25微米的长波长中红外波段实现最高空间分辨率观测。此外，MIMIZUKU拥有一种独特的光学机械装置，名为“现场堆积器”，使我们能够同时观察一对遥远的(<；25角分钟)目标和参考物体，并提高大气校准的精度。这一功能有望提高光度测量精度和光谱数据的质量，即使在大气吸收严重的长波中红外区域也是如此。2018年，在斯巴鲁望远镜上进行了MIMIZUKU的工程观测，并成功实现了其首光。在工程观测中，中红外波段(7.6-25微米)的成像和光谱功能几乎如预期那样工作，尽管由于高读出噪声，灵敏度仍比背景限制性能差几倍。现场堆叠机也被证实工作如预期。结果表明，即使在大气透过率随时间变化10%的情况下，使用现场堆叠器也可以将光度不稳定度降低到几个百分点。它还证实，不仅可以在10微米波段进行光谱观测，而且还可以在20微米波段进行光谱观测，在20微米波段，即使在莫纳克亚遗址也很难进行光谱观测。我们报告这些空中性能评估的结果。
The Mid-Infrared Multi-field Imager for gaZing at the UnKnown Universe (MIMIZUKU) is developed as the first-generation mid-infrared instrument for the University of Tokyo Atacama Observatory (TAO) 6.5-m telescope. MIMIZUKU performs medium-band imaging and low-resolution spectroscopy in 2-38 microns and enables highest-spatial-resolution observations in the long-wavelength mid-infrared beyond 25 microns. In addition, MIMIZUKU has a unique opto-mechanical device called ‘Field Stacker’, which enables us to observe a distant (<25 arcminutes) pair of target and reference objects simultaneously and improves accuracy of atmospheric calibration. This function is expected to improve photometric accuracy and quality of spectroscopic data even in the long-wavelength mid-infrared regions, where the atmospheric absorption is severe. In 2018, engineering observations of MIMIZUKU were carried out at the Subaru telescope, and its first-light was successfully achieved. In the engineering observations, the imaging and spectroscopic functions in the mid-infrared wavelengths (7.6-25 microns) were confirmed to be working almost as expected, although the sensitivity is still worse than the background-limited performance by a factor of a few due to high readout noise. The Field Stacker was also confirmed to be working as expected. It is confirmed that the photometric instability can be reduced to a few percent by using Field Stacker even when the atmospheric transmittance varies by 10% in time. It is also confirmed that spectroscopic observations can be performed not only in 10-micron band but also in 20-micron band, where the spectroscopic observations are difficult even at the Mauna Kea site. We report the results of these on-sky performance evaluations.