WFC3/UVIS:外部CTE监控 2009-2024
WFC3/UVIS: External CTE Monitoring 2009-2024
AI总结:
本研究分析了哈勃望远镜WFC3/UVIS探测器的电荷转移效率(CTE)电荷损失,提供了2009-2024年间CTE校正模型的更新系数,并指出在不同背景水平下存在电荷损失和过校正问题。
摘要:
本报告分析了安装在哈勃空间望远镜上的宽场相机3紫外线成像仪(WFC3/UVIS)上的电荷转移效率(CTE)电荷损失。从2009年10月至2024年2月的约14年观测期间,研究分析了不同总背景水平和源电荷量下的CTE电荷损失趋势。除了分析当前CTE电荷损失状态外,我们还提供了更新的实证模型系数,用于点源光度计校正的非CTE校正(FLT)和CTE校正(FLC)数据。在2009年至2023年间,对于500-2000个电子的源,最远离读出的FLT数据,在1-3个电子/像素的背景下,CTE电荷损失率测量为约0.05 mag/2051像素/年。推荐的最小总背景水平以减轻CTE损失仍保持在20-25个电子/像素。在此水平下,我们发现2024年FLT数据中500-2000个电子的源,最远离读出的,可产生约23%的电荷损失/2051像素。FLC数据提供了一定的缓解,但我们测量到2024年FLC数据中约12%的电荷损失/2051像素。在某些FLC结果中,背景高于40个电子/像素时仍存在轻微的过校正。在2024年,40、60或90个电子/像素背景下的8000-20000个电子源,最远离读出的,分别被过校正约1%、2%和3%。
英文摘要:
This report examines Charge Transfer Efficiency (CTE) flux losses in the Wide Field Camera 3 UVIS detector aboard the Hubble Space Telescope. Spanning approximately 14 years of observations from October 2009 to February 2024, the study analyzes CTE flux loss trends across various total background levels and source fluxes. In addition to analyzing the present state of CTE flux losses, we provide updated coefficients for the empirical model for point source photometry corrections in both non-CTE-corrected (FLT) and CTE-corrected (FLC) data. Between 2009 and 2023, the rate of CTE flux loss for a 500-2000 e$^-$ source, farthest from the readout, in FLT data with a 1-3 e$^-$/pix background, is measured to be $\sim$0.05 $Δ$mag/2051 pix/year. The recommended minimum total background level to mitigate CTE losses remains at 20-25 e$^-$/pix. At that level, we find that 500-2000 e$^-$ sources, farthest from the readout, in 2024 FLT data can suffer $\sim$23$\%$ flux loss/2051 pix. The FLC data provide some relief, but we measure a $\sim$12$\%$ flux loss/2051 pix in 2024. There continues to be a slight over-correction in some FLC results that contain backgrounds above 40 e$^-$/pix. In 2024, 8000-20000 e$^-$ sources farthest from the readout in a 40, 60, or 90 e$^-$/pix background are over-corrected by $\sim$1, 2, and 3$\%$, respectively.
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