ePSFs from "Initial Characterization of Photometry of Roman images from the OpenUniverse Simulations", Aldoroty et al. 2025a

Library of ePSFs associated with "Initial Characterization of Photometry of Roman images from the OpenUniverse Simulations", Aldoroty et al. 2025a. The DOI of this file package is 10.5281/zenodo.15424736. File name format:[cutoutsize]_[centerx]_[centery]_-_19.0_21.5_-_[band].psf- cutoutsize: The pixel edge length of the area this PSF is applicable to (\Delta_{px} in the manuscript). e.g., for a 1 x 1 grid, cutoutsize = 4088. For a 2 x 2 grid, cutoutsize = 2044, etc. - centerx: The x pixel coordinate of the center of the PSF's range, covered by cutoutsize.- centery: The y pixel coordinate of the center of the PSF's range, covered by cutoutsize. - band: The filter this PSF is associated with. - 19.0 and 21.5: the minimum and maximum simulated catalog magnitudes used to select stars to generate this PSF. Each *.psf file is a pickled dictionary, and can be opened with Python's pickle module like: with open(psfpath, 'rb') as f: psf_obj = pkl.load(f) psf_obj is a dictionary with keys dict_keys(['psf', 'truth', 'fitted_stars', 'N_stars', 'band', 'sca', 'x_edges', 'y_edges', 'x_cen', 'y_cen']). - psf is a photutils.psf.ImagePSF object that contains the actual PSF.- truth is a list of astropy tables that contain the simulated catalog information of the stars used to generate this PSF.- fitted_stars is a photutils.psf.epsf_stars.EPSFStars object that contains the fitted stars.- N_stars is the number of stars used to generate the PSF.- band is the filter this PSF is associated with.- sca is the SCA this PSF is associated with.- x_edges and y_edges are the pixel coordinate edges of the region this PSF is associated with.- x_cen and y_cen are the pixel coordinate center of the region this PSF is associated with.