Does anyone know how to create a FITS image file?
I'm using GALFIT to model some SDSS galaxies. A key input is a PSF image, in FITS format:
Yep, that's what I want to do.Originally Posted by GALFIT User's Manual
I can easily find plenty of stars near the galaxy I want to model, and so can model these with GALFIT (they almost circular (axis ratio ~0.95) Sérsic profiles, with n = 0.7 +/-0.05, effective radii = 1.6 +/-0.05 pix). But I have no idea how to turn either the image of a nice SDSS star into a PSF FITS (of the kind GALFIT is happy with, as input), or to create a PSF FITS from an almost circular (axis ratio 0.95) Sérsic profile, with n = 0.7, and effective radius 1.6 pix.
There's some history, over at the Galaxy Zoo forum (here); I'm asking my question here because no one there has responded (I cannot believe that no zooite knows how to do this!)