Improving HST PSF

[fadinammour]

The current HST PSF (which is Gaussian) is too big. We would like to replace it with an optimally smaller PSF that will be used for all the HST images.

Link to a Jupyter Notebook generate a minimal isotropic COSMOS PSF:
https://github.com/ml4astro/galaxy2galaxy/blob/master/notebooks/BuildingCOSMOS_PSF.ipynb

Link to integrate the PSF to a galaxy2galaxy problem using a fits file:
https://github.com/ml4astro/galaxy2galaxy/blob/6d8b20722a5545c8c79a19cb67c6131c061763ed/galaxy2galaxy/data_generators/cosmos.py#L172

• Adapt the first notebook to generate a minimal isotroptic COSMOS PSF for HST

• Compare the COSMOS PSF to the Gaussian PSF and the true HST PSF and check if it's smaller than the Gaussian one.

[fadinammour]

The comparison of the COSMOS and the Gaussian PSF is performed in:

ShapeDeconv/data/BuildingCOSMOS_PSF.ipynb

Line 507 in d704b2d

"## Compare PSF"