Fix Version/s: None
Sprint:DRP S18-3, DRP S18-4, DRP S18-5, DRP S18-6
Team:Data Release Production
Ivezić et al. 2004 (2004AN....325..583I) define a "Principle Color" analysis to estimate the accuracy of the photometric zeropoint calibration. The principle colors are defined by linear combinations of magnitudes in the SDSS bands. The coefficients in that paper are for the SDSS filters. To enable direct comparison with those results, derive the associated values of these coefficients for the HSC filters. The calibration here will start with just the RC2 dataset. A later ticket will use the full PDR1 to calibrate these coefficients.
- is blocked by
DM-13154 Refine limits and labeling for color analysis plots
DM-13650 Add Orthogonal Distance Regression fits to the color analysis
Would you also confirm if you are satisfied that the work of this ticket has been completed as part of
DM-13154? The current calibration of the coefficients can be seen here:
and figures showing the color analysis using these coefficients can be found, for the latest
w_2018_20 RC2 reprocessing, here:
(e.g., for the COSMOS tract 9813:
Work for this ticket is being initiated on
DM-13154. The current status is a rough derivation of the P2 coefficients which look very reasonable compared to the SDSS values (i.e. the differences are easily understood in terms of different filter response functions). Slight refinements may be made after the per-object Galactic Extinction correction is implemented in DM-13519. Also, the need for a P2 -> P2' calibration (based on a slight dependence of P2 vs. r band mag observed in the SDSS data: see Fig 2 and Section 3.2.1 of Ivezić et al. 2004) will be further investigated on DM-14556 (in conjunction with DM-14196 and after implementing DM-13519).