WFPC2 CTE损失的一种修正的表征
A Revised Characterization of the WFPC2 CTE Loss
摘要：
哈勃太空望远镜上的宽视场行星照相机2（WFPC 2）的电荷转移损失是该照相机获得的恒星测光不确定性的主要来源。这种效应在相机安装后不久就被发现了，随着时间的推移，它会使恒星变暗十分之几个星等（在特别糟糕的情况下甚至更多）。在1998年至2000年期间的几项研究中描述了CTE损失对WFPC 2恒星测光的影响，但自从ACS成为HST的主要成像仪后，人们的关注就减少了。在2007年1月ACS失败后，WFPC 2再次成为HST上的主要成像仪器，恢复了确保准确CTE校正的重要性。本文重新研究了WFPC 2的CTE损失，与以前的研究相比有三个显著的变化。首先，本研究认为，通过2007年获得的校准数据，从而增加了置信度的CTE校正的可靠性时，适用于最近的观测。其次，在读出过程中的CTE损失的变化占分析。最后，对CTE对计数、背景和观察日期的依赖性进行了重新分析。由此产生的校正比WFPC 2仪器手册（Dolphin 2002年和2004年更新）中提供的更准确，导致在某些情况下可以增强5%以上的光度。
英文摘要：
Charge-transfer loss on the Wide Field Planetary Camera 2 (WFPC2) onboard the Hubble Space Telescope is a primary source of uncertainty in stellar photometry obtained with this camera. This effect, discovered shortly after the camera was installed, has grown over time and can dim stars by several tenths of a magnitude (or even more, in particularly bad cases). The impact of CTE loss on WFPC2 stellar photometry was characterized by several studies between 1998 and 2000, but has received diminished attention since ACS became HST's primary imager. After the failure of ACS in January 2007, WFPC2 once again became the primary imaging instrument onboard HST, restoring the importance of ensuring accurate CTE corrections. This paper re-examines the CTE loss of WFPC2, with three significant changes over previous studies. First, the present study considers calibration data obtained through 2007, thus increasing the confidence in the reliability of the CTE corrections when applied to recent observations. Second, the change in CTE loss during readout is accounted for analytically. Finally, a reanalysis of the CTE dependencies on counts, background, and observation date was made. The resulting correction is significantly more accurate than that provided in the WFPC2 Instrument Handbook (Dolphin 2002 and updates through 2004), resulting in photometry that can be enhanced by over 5% in certain circumstances.
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