Above is the coverage map for PSFs. Plotted are the locations of galaxies in the COSMOS field. Overplotted are the PSF regions, coloured by the number of stars less than magnitude 24 and within 2 arcminutes. You can see how I downloaded the PSFs from PSF picker. The region on the left side of the image with a higher density is because of a required second download (it is a very finicky application and doesn’t download all the PSFs). This was consistent across all HSC bands.
This is the same coverage map, but for stars within a 4 arcminute distance. Once we increase the distance, we definitely have a suitable number of stars for PSF creation.
Saturation Tests
Moving on, a secondary look at the catalogue and indeed, peak surface brightness values are contained. I added them to my active catalogue with a quick concatenation using TopCat. After this, I plotted the “clean” values against each other (non-flagged with a -100 value for both the peak SB and magnitude) in the following plots.
These provide some interesting results. Based on my interpretation from this figure, this implies no saturated stars right? Saturation would, if I remember correctly, show up as a flattened region at the bright (leftmost) end of each figure.
More to come! Cedar has been a little finicky over the past couple days, but I should have all stars (in both u and uS bands) with a “proxy” SNR above 50 extracted.
HSC Research 