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  1. Data Management
  2. DM-13651

Derive "Principle Color" coeffecients à la Ivezić et al. 2004 for the HSC filters

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    Details

    • Type: Story
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: pipe_analysis
    • Labels:
      None
    • Story Points:
      4
    • Epic Link:
    • Sprint:
      DRP S18-3, DRP S18-4, DRP S18-5, DRP S18-6
    • Team:
      Data Release Production

      Description

      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.

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          is blocked by

          Story - Created by Jira Software - do not edit or delete. Issue type for a user story. DM-13154 Refine limits and labeling for color analysis plots

          • Done

          Story - Created by Jira Software - do not edit or delete. Issue type for a user story. DM-13650 Add Orthogonal Distance Regression fits to the color analysis

          • Done
          relates to

          Story - Created by Jira Software - do not edit or delete. Issue type for a user story. DM-14556 Investigate the need for a P2 -> P2' calibration for the HSC Principle Color analysis

          • To Do

          Story - Created by Jira Software - do not edit or delete. Issue type for a user story. DM-14590 Refine HSC Principle Color coefficient calibration based on latest PDR1 processing

          • To Do

          Story - Created by Jira Software - do not edit or delete. Issue type for a user story. DM-14826 Add Principal Color axes to stellar color-color plots

          • Done

            Activity

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            lauren Lauren MacArthur added a comment - - edited

            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).

            Show
            lauren Lauren MacArthur added a comment - - edited 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 ).
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            lauren Lauren MacArthur added a comment -

            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:
            https://github.com/lsst-dm/pipe_analysis/blob/master/python/lsst/pipe/analysis/colorAnalysis.py#L83
            and figures showing the color analysis using these coefficients can be found, for the latest
            w_2018_20 RC2 reprocessing, here:

            https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/

            (e.g., for the COSMOS tract 9813:
            wPerp:
            https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-griPSF-wFit-fit.png
            https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_wPerp-psfMagHist.png
            https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_wPerp-sky-stars.png

            xPerp:
            https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-griPSF-xFit-fit.png
            https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_xPerp-psfMagHist.png
            https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_xPerp-sky-stars.png)

            Show
            lauren Lauren MacArthur added a comment - 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: https://github.com/lsst-dm/pipe_analysis/blob/master/python/lsst/pipe/analysis/colorAnalysis.py#L83 and figures showing the color analysis using these coefficients can be found, for the latest w_2018_20 RC2 reprocessing, here: https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/ (e.g., for the COSMOS tract 9813: wPerp: https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-griPSF-wFit-fit.png https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_wPerp-psfMagHist.png https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_wPerp-sky-stars.png xPerp: https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-griPSF-xFit-fit.png https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_xPerp-psfMagHist.png https://lsst-web.ncsa.illinois.edu/~hchiang2/RC2_w_2018_20/pipe_analysis/qaPlots/color/tract-9813/plot-t9813-color_xPerp-sky-stars.png )
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            yusra Yusra AlSayyad added a comment -

            Will you link the later ticket that will use the full PDR1?

            Show
            yusra Yusra AlSayyad added a comment - Will you link the later ticket that will use the full PDR1?
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            lauren Lauren MacArthur added a comment -

            Done: DM-14590

            Show
            lauren Lauren MacArthur added a comment - Done: DM-14590

              People

              Assignee:
              lauren Lauren MacArthur
              Reporter:
              lauren Lauren MacArthur
              Reviewers:
              Yusra AlSayyad
              Watchers:
              John Swinbank, Lauren MacArthur, Yusra AlSayyad
              Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:

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