期刊
EXPERIMENTAL ASTRONOMY
卷 22, 期 1-2, 页码 51-66出版社
SPRINGER
DOI: 10.1007/s10686-007-9082-5
关键词
CCD cameras; wide-field survey telescope; gravitational microlensing
资金
- Japan Ministry of Education, Science, Sports and Culture
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 -80 degrees C, at which temperature dark current noise is negligible for a typical 1-3 min 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 s. 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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