![]() If you want a fluxĪppropriate for a longer exposure, or for a telescope with a different collecting area than HST, Parameter below, and also caveats related to using the flux parameter). HST data, scaled to correspond to a 1 second HST exposure (though see the area_norm If you don’t set a flux, the flux of the returned object will be the flux of the original Significant inaccuracy can result from using other combinations of these parameters moreĭetails can be found in, especially table 1, and in comment ![]() Note that tests suggest that for optimal balance between accuracy and speed, k_interpolantĪnd pad_factor should be kept at their default values. Keywords for choosing a galaxy exactly one must be set. Galaxy, and saved versions of the original HST image and PSF). This initializes real_galaxy with three InterpolatedImage objects (one for the deconvolved flux = None, pad_factor = 4, noise_pad_size = 0. rng = None, x_interpolant = None, k_interpolant = None. RealGalaxy ( real_galaxy_catalog, index = None, id = None, random = False. This is necessary to eliminate noise that was amplified due to deconvolution of the PSF that is at least as large as the original HST PSF (stored as an attribute) before renderingĪny images. ![]() GSObject.drawImage function, and it is essential that users convolve each RealGalaxy with a Passbands, and/or parametric representations, should use the COSMOSGalaxy class.īecause RealGalaxy involves a Deconvolution, method = 'phot' is unavailable for the Users who wish to draw RealGalaxies that have well-defined flux scalings in various Might be needed to make or interpret the simulations, e.g., the noise properties of the trainingĭata. Also included in the class is additional information that RealGalax圜atalog documentation) to read in data about realistic galaxies that can be used for This class uses a catalog describing galaxies in some training data (for more details, see the Uses a Convolution instance of an InterpolatedImage (for the observed galaxy) with aĭeconvolution of another InterpolatedImage (for the PSF). RealGalaxy ( real_galaxy_catalog, index = None, id = None, random = False, rng = None, x_interpolant = None, k_interpolant = None, flux = None, flux_rescale = None, pad_factor = 4, noise_pad_size = 0, area_norm = 1.0, gsparams = None, logger = None ) ¶Ī class describing real galaxies from some training dataset. GalSim/examples/data/real_galaxy_catalog_23.5_example.fitsįor access to larger catalogs of objects, see Downloading the COSMOS Catalog below.
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