MiniTAO/MAX38 first light:30-micron band observations from the ground-based telescope
MiniTAO/MAX38 first light:30-micron band observations from the ground-based telescope
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MiniTAO/MAX38第一道光：地面望远镜的30微米波段观测
DOI：
10.1117/12.856228
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Tana
中科院分区：
文献类型：
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作者：
Nakamura;T.;T. Miyata;S. Sako;K. Asano;M. Uchiyama;T. Tanabe;M. Yoneda;Y. Ita;T. Onaka;H. Kataza;T. Aoki;M. Doi;T. Handa;D. Kato;K. Kawara;K. Kohno;M. Konishi;S. Koshida;T. Minezaki;N. Mitani;K. Motohara;R. Ohsawa;T. Soyano;M. Tana
我们研制的中红外仪器MAX38安装在东京大学阿塔卡马分校1.0 m望远镜（miniTAO望远镜）上，首次成功地在地面望远镜上进行了30微米的观测。由于miniTAO的高海拔（5640米）和阿塔卡马站点的干燥天气条件，我们可以通过地面望远镜进入30微米波长区域。为了实现30微米波段的观测，MAX38采用了一些重要的器件。首先，安装了一个Si:Sb 128x128阵列探测器，可以探测到38微米长的中红外光。其次，我们开发了用于30微米区域带通滤波器的金属网状滤波器，该滤波器由若干带交叉孔的金薄膜组成。第三，在MAX38光学器件中内置一个冷斩波器，这是一个由压电驱动器控制的6厘米方形平面镜，用于抵消大气湍流噪声。它可以在频率超过5赫兹的情况下，以50弧秒的速度进行方波斩波。最后，低色散格栅光谱仪（R~50）将提供20 ~ 40微米的地球大气透射光谱信息。在这次观测中，我们清楚地证明了30微米左右的大气窗口可以用于miniTAO站点的天文观测。
We successfully carried out 30-micron observations from the ground-based telescope for the first time with our newly developed mid-infrared instrument, MAX38, which is mounted on the University of Tokyo Atacama 1.0-m telescope (miniTAO telescope). Thanks to the high altitude of the miniTAO (5,640m) and dry weather condition of the Atacama site, we can access the 30-micron wavelength region from ground-based telescopes. To achieve the observation at 30- micron wavelength, remarkable devices are employed in MAX38. First, a Si:Sb 128x128 array detector is installed which can detect long mid-infrared light up to 38-micron. Second, we developed metal mesh filters for 30-micron region band-pass filter, which are composed of several gold thin-films with cross-shaped holes. Third, a cold chopper, a 6-cm square plane mirror controlled by a piezoelectric actuator, is built into the MAX38 optics for canceling out the atmospheric turbulence noise. It enables square-wave chopping with a 50-arcsecound throw at a frequency more than 5- Hz. Finally, a low-dispersion grism spectrometer (R~50) will provide information on the transmission spectrum of the terrestrial atmosphere in 20 to 40 micron. In this observation, we clearly demonstrated that the atmospheric windows around 30-micron can be used for the astronomical observations at the miniTAO site.