PhoSim Tutorial 5: How to Simulate Different Telescopes
phosim catalog -i instrument
phosim examples/large_catalog_long_exposure -i lsst -c examples/nocosmics
phosim examples/large_catalog_long_exposure -i wiyn_odi -c examples/nocosmics
phosim examples/large_catalog_long_exposure -i nircam_sw_a -c examples/nocosmics
The WIYN image:
The JWST NirCAM image:
In this way, the same scene has been generated through multiple telescopes, and there are very different output images. The PSF, plate scale, background level, and overall intensity will be the most obvious differences, but many other details will make the images different. Notice the same three bright stars appear in a line on these images. In the JWST image they fit in the whole chip whereas they are near the center of the LSST and WIYN images reflecting the various different plate scales and field of views. The differences in background levels, PSF sizes, and plate scales leads to differing source detection limits.