Charge Diffusion Variations in Pan-STARRS1 CCDs
Charge Diffusion Variations in Pan-STARRS1 CCDs
复制标题
Pan-STARRS1 CCD 中的电荷扩散变化
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Hubble Fellow
中科院分区：
文献类型：
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作者：
E. Magnier;J. Tonry;D. Finkbeiner;E. Schlafly;W. Burgett;K. Chambers;H. Flewelling;K. Hodapp;N. Kaiser;R. Kudritzki;N. Metcalfe;R. Wainscoat;C. Z. W. U. I. F. Astronomy;H. C. F. Astrophysics;Durham University Department of Physics;Lawrence Livermore National Laboratory;Hubble Fellow
厚背照式深耗尽型CCD具有优于前几代薄型和传统厚CCD的上级量子效率。因此，它们被用于多个重大项目中的宽视场成像相机。我们使用来自Pan-STARRS 3π调查的观测结果来表征Pan-STARRS 1千兆像素相机中使用的深度耗尽器件的行为。我们已经确定了光度测量和恒星轮廓中的系统空间变化，这些变化在模式上与其他宽视场相机（例如，DECam和Hypelprime相机）。在这些其他相机中识别出的树环特征是由横向电场引起的，该电场在电子在硅中传输到像素位置时使电子移位。相比之下，我们表明，在GPC 1探测器中观察到的光度和形态的修改是由垂直电荷传输速率的变化和由此产生的电荷扩散变化引起的。
Thick back-illuminated deep-depletion CCDs have superior quantum efficiency over previous generations of thinned and traditional thick CCDs. As a result, they are being used for wide-field imaging cameras in several major projects. We use observations from the Pan-STARRS 3π survey to characterize the behavior of the deep-depletion devices used in the Pan-STARRS 1 Gigapixel Camera. We have identified systematic spatial variations in the photometric measurements and stellar profiles that are similar in pattern to the so-called “tree rings” identified in devices used by other wide-field cameras (e.g., DECam and Hypersuprime Camera). The tree-ring features identified in these other cameras result from lateral electric fields that displace the electrons as they are transported in the silicon to the pixel location. In contrast, we show that the photometric and morphological modifications observed in the GPC1 detectors are caused by variations in the vertical charge transportation rate and resulting charge diffusion variations.