천문학논총 (Publications of The Korean Astronomical Society)

  • 제31권3호
  • /
  • Pages.35-41
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  • 2016
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  • 1225-1534(pISSN)
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  • 2287-6936(eISSN)
한국천문학회 (The Korean Astronomical Society)
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KMTNet 모자이크 CCD 영상의 크로스톡 보정

CROSSTALK CORRECTION OF THE KMTNet MOSAIC CCD IMAGE

  • 투고 : 2016.05.11
  • 심사 : 2016.06.16
  • 발행 : 2016.12.31
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초록

We have constructed a wide-field photometric survey system called as the Korea Microlensing Telescope Network (KMTNet) in 2015. It consists of three 1.6 m optical telescopes equipped with mosaic CCD cameras. Four 9k CCDs were installed on the focal plane of each telescope. In this paper, we present the crosstalk analysis of the KMTNet mosaic CCD images. The crosstalk victims caused by bright sources were visible at eight sub-images obtained through different readout ports of each CCD. The crosstalk coefficients were estimated to be several tens of $10^{-4}$ in maximum, differing from sub-image to sub-image, and the non-linearity effect certainly appeared at the victims made from saturated sources. We developed software functions to correct the crosstalk effect of the KMTNet CCD images. The software functions showed satisfying results to remove clearly most of the crosstalk victims and have been implemented in the KMTNet image processing pipeline since 2015 September.

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참고문헌

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