MOA-cam3：新西兰重力微透镜测量用宽视场镶嵌CCD照相机
MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand
摘要：
我们已经开发了一个宽视场镶嵌CCD相机，MOA-cam 3，安装在主焦点的天体物理学微透镜观测（MOA）1.8米望远镜。该相机由10个E2 V CCD 4482芯片组成，每个芯片具有2kx 4k像素，单次曝光可覆盖2.2 deg^2的视场。光学系统经过很好的优化，可在此宽视场内实现均匀的图像质量。芯片由-80 ℃的低温冷却器持续冷却，在该温度下，对于典型的1-3分钟暴露，暗电流噪声可以忽略不计。CCD输出电荷通过GenIII系统（Astronomical Research Cameras Inc.）读数在25秒内2- 3ADU（rms）的读出噪声也可以忽略不计。我们准备了一个有效的微透镜调查的宽带红色过滤器，也贝塞尔V，我过滤器的标准天文研究。微透镜研究已经进入了一个新的时代，需要更多的统计数据和更快的警报来捕捉奇异的光曲线。我们的新系统是实现这两个要求的强大工具。
英文摘要：
We have developed a wide-field mosaic CCD camera, MOA-cam3, mounted at the prime focus of the Microlensing Observations in Astrophysics (MOA) 1.8-m telescope. The camera consists of ten E2V CCD4482 chips, each having 2kx4k pixels, and covers a 2.2 deg^2 field of view with a single exposure. The optical system is well optimized to realize uniform image quality over this wide field. The chips are constantly cooled by a cryocooler at -80C, at which temperature dark current noise is negligible for a typical 1-3 minute exposure. The CCD output charge is converted to a 16-bit digital signal by the GenIII system (Astronomical Research Cameras Inc.) and readout is within 25 seconds. Readout noise of 2--3 ADU (rms) is also negligible. We prepared a wide-band red filter for an effective microlensing survey and also Bessell V, I filters for standard astronomical studies. Microlensing studies have entered into a new era, which requires more statistics, and more rapid alerts to catch exotic light curves. Our new system is a powerful tool to realize both these requirements.
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