AI 中文总结
本研究更新了WFC3/UVIS选定滤光片的环绕能量值，改进了小半径处的精度，修正了大半径处的模型偏差，影响了UVIS零点，相关表将于2026年发布。
AI 中文摘要
我们给出了部分UVIS滤光片的更新环绕能量（EE）曲线，这些曲线源于对当前EE校准所依据的重采样点扩散函数（PSF）数据的重新分析，以及对PSF翼部的深度观测所得的新测量结果。应用于重采样PSF的改进中心定位和分析技术，在小半径（r ≤ 10像素）下得到了更准确的EE值，使结果与一项大型存档PSF研究（Huynh等人，2025）更为吻合。在大半径处，我们利用六个滤光片的PSF翼部深度观测，将2角秒至6角秒之间的光占比与PSF光学模型（Hartig，2009）的预测进行比较。对于 pivot 波长≥4000埃的滤光片，模型与经验数据一致，但对紫外滤光片在2角秒处的EE高估了约0.5%。修订后的EE解会影响UVIS零点，这些零点源于0.4角秒（10像素）半径内的孔径测光，并通过EE表校正至6角秒（Calamida等人，2022）。总体而言，影响较小；多个滤光片（F218W、F225W、F275W、F775W、F814W、F845M）在0.4角秒处的EE增大了≥0.5%（0.005星等），尤其对UVIS2而言。相比之下，长通滤光片（F200LP、F350LP、F850LP）在0.4角秒处的EE通常更小，其中F850LP的差异约为2%（0.02星等）。更新后的EE表将与修订后的UVIS反灵敏度表和零点一同于2026年晚些时候发布，在此期间，我们在附录A中提供了常用滤光片的EE表。
英文摘要
We present updated encircled energy (EE) curves for a subset of UVIS filters. These are derived from a reanalysis of the drizzled Point Spread Function (PSF) data underlying the current EE calibration together with new measurements from deep observations of the PSF wings. Improved centroiding and analysis techniques applied to the drizzled PSFs produce more accurate EE values at small radii ($r \le 10$ pixels), bringing the results into closer agreement with a large archival PSF study (Huynh et al. 2025). At large radii, we leverage deep observations of the PSF wings in six filters and compare the fraction of light between 2" and 6" with predictions from an optical model of the PSF (Hartig 2009). For filters with pivot wavelengths $ \gtrsim{4000} \mathrm{\mathring{A}}$, the model agrees with the empirical data, but over-estimates the EE for UV filters by $\sim0.5$% at 2". The revised EE solutions affect the UVIS zeropoints, which are derived from aperture photometry in a 0.4" (10 pixel) radius and corrected to 6" using EE tables (Calamida et al. 2022). Overall, the impact is small; the EE at 0.4" is larger by $ \gtrsim{0.5}$ % (0.005 mag) for several filters (F218W, F225W, F275W, F775W, F814W, F845M), especially for UVIS2. In contrast, the EE value is generally smaller at 0.4" for long-pass filters (F200LP, F350LP, F850LP), with F850LP differing by $\sim2 $ % (0.02 mag). Updated EE tables will be delivered together with a revised set of UVIS inverse sensitivity tables and zeropoints later in 2026. In the interim, we provide EE tables for commonly used filters in Appendix A.
Comments31 pages, 14 figures
