The SDSS photometric pipeline performs a morphological
star/galaxy separation. The quality of this separation is
therefore intimately related to the seeing and
sky brightness. Photo's classifications have been tested against
those of the COMBO
survey (which effectively uses low-resolution spectroscopy for
star/galaxy separation) in a region of the sky that both surveys have
scanned. While the comparison was carried out for DR1 data, the DR2/DR3
data are not significantly different.
We assess the quality of the SDSS star/galaxy separation
using the COMBO S11
field which corresponds to SDSS run 1140 camcol 5 fields 151-154,
run 1231 fields 42-25 camcols 5-6. We assume the COMBO classification
is correct and determine which fraction of SDSS-detected objects is
classified identically by SDSS.
To see how the seeing and sky brightness of these fields
compare to the rest of the SDSS, look at the seeing and sky
brightness in the SDSS/COMBO overlap region.
Last modified: Wed Mar 10 14:50:06 CST 2004