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  1. DRP 2-D Pipeline
  2. PIPE2D-1518

fix flux normalization variation in flux calibration

    Details

    • Epic Link:
    • Sprint:
      preRun18August1, EngRun18August, PostRun18, preRun19Oct2024, postRun19Oct, preRun20Jan

      Description

      pfsSingle spectra of the same FLUXSTDs from different visits reveal a significant variation in the flux normalization. This is an example from GE visits from run16 and 17. fluxCalQa also shows varying residual in the i-band between PFS and PS1. This ticket investigates the flux variation.

        Attachments

        1. fluxCalQA_caption.png
          110 kB
          Masayuki Tanaka
        2. fluxCalQA_v114908_z15.png
          413 kB
          Masayuki Tanaka
        3. fluxCalQA_v114908.png
          405 kB
          Masayuki Tanaka
        4. fluxloss.png
          39 kB
          Masayuki Tanaka
        5. image (8).png
          139 kB
          Masayuki Tanaka
        6. image-2024-09-30-15-29-23-191.png
          181 kB
          Masayuki Tanaka
        7. image-2024-11-15-20-12-17-417.png
          300 kB
          Masayuki Tanaka
        8. magMergedDiff_visit111489.png
          63 kB
          Masayuki Tanaka
        9. magMergedDiff_visit111803.png
          62 kB
          Masayuki Tanaka
        10. pfiOffset_visit111489.png
          40 kB
          Masayuki Tanaka

          Issue Links

          relates to

          Task - A task that needs to be done. PIPE2D-1578 investigate FLUXSTDs with no flux

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            5 older comments
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            msyktnk Masayuki Tanaka added a comment - - edited

            These plots summarize the changes. The first one is the current default (no wavelength dependent correction, 3rd order polynomial, etc), and the 2nd one includes the suggested changes above.  Both the i-band difference and g-z color difference from PS1 (two panels on the bottom left) are improved.

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            msyktnk Masayuki Tanaka added a comment - - edited These plots summarize the changes. The first one is the current default (no wavelength dependent correction, 3rd order polynomial, etc), and the 2nd one includes the suggested changes above.  Both the i-band difference and g-z color difference from PS1 (two panels on the bottom left) are improved.
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            msyktnk Masayuki Tanaka added a comment -

            Figure caption:

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            msyktnk Masayuki Tanaka added a comment - Figure caption:
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            msyktnk Masayuki Tanaka added a comment -

            There is still a several percent scatter. I think some (or maybe majority) of which is due to random fiber offset (the amount of fiber offset differs from fiber to fiber and there is not global structure over the focal plane). The random scatter cannot be corrected for by the focal plane fit. I will update my write-up on the fiber loss in PIPE2D-1581.

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            msyktnk Masayuki Tanaka added a comment - There is still a several percent scatter. I think some (or maybe majority) of which is due to random fiber offset (the amount of fiber offset differs from fiber to fiber and there is not global structure over the focal plane). The random scatter cannot be corrected for by the focal plane fit. I will update my write-up on the fiber loss in PIPE2D-1581 .
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            sogo.mineo sogo.mineo added a comment -

            Could you review this pull request?

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            sogo.mineo sogo.mineo added a comment - Could you review this pull request?
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            sogo.mineo sogo.mineo added a comment -

            Merged. Thanks for reviewing the PR.

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            sogo.mineo sogo.mineo added a comment - Merged. Thanks for reviewing the PR.

              People

              • Assignee:
                msyktnk Masayuki Tanaka
                Reporter:
                msyktnk Masayuki Tanaka
                Reviewers:
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                  Updated:
                  Resolved: