Image Details
Caption: Figure 4.
Example of a stacked PSF for NIRCam/F444W. The vertical dotted lines show the diameters of the six circular apertures used for photometry (0﹩\mathop{.}\limits^{^{\prime\prime} }﹩2, 0﹩\mathop{.}\limits^{^{\prime\prime} }﹩3, 0﹩\mathop{.}\limits^{^{\prime\prime} }﹩4, 0﹩\mathop{.}\limits^{^{\prime\prime} }﹩5, 0﹩\mathop{.}\limits^{^{\prime\prime} }﹩7, and 1﹩\mathop{.}\limits^{^{\prime\prime} }﹩0). Compared to the results from Webbpsf (M. D. Perrin et al. 2015; S. Osborne et al. 2018), the enclosed energy of the stacked F444W PSF can be significantly lower at d < 0﹩\mathop{.}\limits^{^{\prime\prime} }﹩4. Similar bias has also been reported by Z. Ji et al. (2024).
© 2026. The Author(s). Published by the American Astronomical Society.