Brighter-fatter effect in near-infrared detectors -- III. Fourier-domain treatment of flat field correlations and application to WFIRST
Jenna K. C. Freudenburg, Jahmour J. Givans, Ami Choi, Christopher M. Hirata, Chris Bennett, Stephanie Cheung, Analia Cillis, Dave Cottingham, Robert J. Hill, Jon Mah, Lane Meier
Weak gravitational lensing has emerged as a leading probe of the growth of cosmic structure. However, the shear signal is very small and accurate measurement depends critically on our ability to understand how non-ideal instrumental effects affect astronomical images. WFIRST will fly a focal plane containing 18 Teledyne H4RG-10 near infrared detector arrays, which present different instrument calibration challenges from previous weak lensing observations. Previous work has shown that correlation functions of flat field images are effective tools for disentangling linear and non-linear inter-pixel capacitance (IPC) and the brighter-fatter effect (BFE). Here we present a Fourier-domain treatment of the flat field correlations, which allows us to expand the previous formalism to all orders in IPC, BFE, and classical non-linearity. We show that biases in simulated flat field analyses in Paper I are greatly reduced through the use of this formalism. We then apply this updated formalism to flat field data from three WFIRST flight candidate detectors, and explore the robustness to variations in the analysis. We find that the BFE is present in all three detectors, and that its contribution to the flat field correlations dominates over the non-linear IPC. The magnitude of the BFE is such that the effective area of a pixel is increased by $(3.54\pm0.03)\times 10^{-7}$ for every electron deposited in a neighboring pixel. We compare IPC maps from flat field autocorrelation measurements to those obtained from the single pixel reset method and find a median difference of 0.113%. After further diagnosis of this difference, we ascribe it largely to an additional source of cross-talk, the vertical trailing pixel effect, and recommend further work to develop a model for this effect. These results represent a significant step toward calibration of the non-ideal effects in WFIRST detectors.
The Nancy Grace Roman Space Telescope Wide Field Instrument: Characterization of the Brighter-Fatter Effect in a Roman H4RG-10 Detector using the Talbot Effect
University of Maryland, Baltimore County（马里兰大学巴尔的摩县分校）；NASA Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）；Center for Research and Exploration in Space Science and Technology（空间科学与技术研究探索中心）；Space Telescope Science Institute（太空望远镜科学研究所）
Charge migration characterization in the METIS H2RG detectors
Max-Planck-Institut für Astronomie（马克斯·普朗克天文学研究所）；European Southern Observatory（欧洲南方天文台）；Institute of Astronomy, KU Leuven（荷语鲁汶大学天文学研究所）；UK Astronomy Technology Centre（英国天文学技术中心）
AMIGO: a Data-Driven Calibration of the JWST Interferometer
Sydney Institute for Astronomy, School of Physics, University of Sydney（悉尼大学物理学院天体物理研究所）；School of Mathematical & Physical Sciences, Macquarie University（麦考瑞大学数学与物理科学学院）；Department of Physics and Astronomy, University of Victoria（维多利亚大学物理与天文系）；Space Telescope Science Institute（太空望远镜科学研究所）；European Southern Observatory（欧洲南方天文台）
本文提出AMIGO框架，通过端到端可微架构校准JWST干涉仪，提升高对比度成像性能，成功恢复AB Dor AC双星并发现HD206893B和HD206893c，超越现有算法。
