SVA1 Gold 1.0.2a with MAG_AUTO Recalibration¶
Following on the apparent differences between the SLR calibration using MAG_AUTO and MAG_PSF measurements of stars detailed in this post:
SLR corrections for MAG_PSF and MAG_AUTO, I (Eli) have turned the MAG_AUTO calibration into new "Gold-like" catalogs which are linked below. All the magnitudes are produced, but for these catalogs the MAG_AUTO catalog is the most interesting. Star/galaxy classification is still modest_class, etc, etc.
The Fine Print¶
- The SLR calibration was run on a 4x coarser NSIDE=128 grid rather than Keith's v6 recalibration with NSIDE=256. I'm hoping this doesn't make a big difference, but it may at the boundaries. (The coarse grid is easier because no pixels fail to fit...)
- Keith's slr_zeropoint_shiftmap code was used, which includes bilinear interpolation between pixels. The exact shift value is recorded in the basic catalog below (as with Gold).
- SLR calibration was not performed on the COSMOS field. Keith needed to handle this specially because of the lack of 2MASS comparison stars (they were all saturated in the long-exposure SE imaging.) However, some offset values were inferred by the code...I need to investigate this. Do not trust the COSMOS Field
- Do not trust the COSMOS Field at RA=150, Dec=2
- Note that due to differences in the MAG_AUTO and MAG_PSF definitions, there are not only color shifts between Gold 1.0.2 and 1.0.2a, but there are overall magnitude shifts of up to ~0.05 mag. The depth maps have not been updated for this offset. At the moment, I'm just hoping this isn't vital for testing.
SLR Calibration Files¶
The SLR file attached can be used with Keith's slr_zeropoint_shiftmap code. However, line 36 in that code needs to be altered from:
if 'n_' not in filter:
if 'n_' not in filter and 'N_' not in filter:
Or, just use the shift values for each object by COADD_OBJECT_ID in the basic file above!