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Photometric Calibration

Photometric Calibration. Jorge F. Garc í a Yus GEMINI Observatory Barolo 2001. GSC-II Photometric Calibration. Calibrators: GSPC-I B, V magnitudes and brighter than 15 th TYCHO B Tycho , V Tycho magnitudes and brighter than 11.5 th GSPC-II B, V, R magnitudes and fainter as 20 th

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Photometric Calibration

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  1. Photometric Calibration Jorge F. García Yus GEMINI Observatory Barolo 2001

  2. GSC-II Photometric Calibration • Calibrators: • GSPC-I • B, V magnitudes and brighter than 15th • TYCHO • BTycho, VTycho magnitudes and brighter than 11.5th • GSPC-II • B, V, R magnitudes and fainter as 20th • Color transformations: • One pair for each pass band available • Range of validate

  3. Cont…. • Photographic plate material and filters: • IIIaJ+GG385, IIIaF+RG610, IIIaJ+GG395, IIIaF+OG590…… • Scanning and digitalization: • GAMMA 1 and GAMMA 2, laser and white light • Pipeline data processing: • SKYPROCESSOR • INVENTORY • DEBLENDER • FINDCAT • PHOTOSOL • APPLY_CALYB

  4. GSC 2 Photometric Calibration: from GSH files

  5. Number of calibrators per field

  6. Statistic are over estimated by known problems.Stars with more than one color, calibrators with poor astrometry and multiple observations.

  7. Inconsistence in early reference catalogs version.

  8. UKST southern hemisphere material: IIIaJ+GG395 (blue) and IIIaF+OG590 (red)

  9. POSS-II northern hemisphere material: IIIaJ+GG385 (blue) and IIIaF+RG610 (red)

  10. POSS-II special constrains: location of original photometric calibrators are vignetted

  11. GSC 2.2.01 data: photometric analyze • From 1715 square degrees (full sky coverage) • Rejected 77 southern fields where J magnitude are not present (+/- 10° galactic latitude, SMC and LMC) ~5% • Founded and rejected 32, plates with suspicious photometry. (mainly large color residuals) • Total for analyze 1606 plates or 1606 square degrees

  12. Faint Art. #s #cal dis err Plate Date Comment 19.5 19.6 3 805 0.7 0.10 XJ005 7-JAN-2000 18.7 18.7 4 855 0.6 0.11 XP005 23-NOV-1999 19.8 19.7 1 578 0.1 0.11 XJ007 19-DEC-2000 19.1 18.7 1 406 0.1 0.13 XP007 7-JAN-2000 17.2 16.9 1 515 0.2 0.11 XJ016 7-JAN-2000 No faint GSPC2 16.2 15.9 1 541 0.2 0.13 XP016 7-JAN-2000 No faint GSPC2 17.1 16.8 1 413 0.1 0.09 XJ017 20-DEC-1999 No faint GSPC2 17.7 17.5 2 293 0.1 0.13 XP017 14-OCT-1999 No faint GSPC2 19.8 19.8 1 404 0.3 0.10 XJ020 7-JAN-2000 18.5 18.4 1 424 0.3 0.13 XP020 7-JAN-2000 20.8 20.7 3 699 0.2 0.17 XJ057 20-DEC-1999 18.6 18.7 3 806 0.1 0.13 XP057 17-JAN-2000 20.2 20.1 1 698 0.2 0.15 XJ074 6-SEP-2000 10.9 11.3 1 86 0.0 0.14 XP074 1-NOV-1999 No GSPC2 20.6 20.7 1 627 0.0 0.11 XJ219 19-DEC-2000 19.8 19.9 1 356 0.1 0.11 XP219 18-JUL-2001 21.0 21.2 3 958 2.5 0.15 XJ288 28-OCT-1999 17.4 17.2 2 77 0.3 0.18 XP288 27-DEC-2000 No faint GSPC2 19.2 19.3 6 775 0.1 0.12 XJ340 8-MAR-2000 low galactic latitude 17.6 17.5 0 1174 0.0 0.19 XP340 21-JUN-2000 No faint GSPC2 20.3 20.5 1 280 1.2 0.18 XJ428 6-JAN-2000 19.7 19.7 1 504 1.0 0.14 XP428 6-DEC-1999 20.4 20.2 4 675 0.1 0.10 XJ493 23-AUG-2000 19.2 19.3 2 610 0.0 0.11 XP493 20-OCT-1999 20.8 20.8 2 324 0.2 0.10 XJ533 7-JAN-2000 18.7 18.7 2 272 0.3 0.13 XP533 7-DEC-1999 20.3 20.4 1 166 0.4 0.11 XJ599 11-JAN-2000 18.4 18.3 1 177 0.4 0.12 XP599 16-JAN-2001 18.4 18.1 2 134 0.2 0.08 XJ653 1-FEB-2000 17.4 17.2 2 150 0.2 0.12 XP653 16-DEC-1999 No faint GSPC2 20.0 20.0 1 195 0.4 0.12 XJ660 6-JAN-2000 11.6 11.8 0 132 0.0 0.16 XP660 16-DEC-1999 No GSPC2 20.7 20.6 2 246 1.3 0.16 XJ669 7-JAN-2000 19.0 18.8 1 201 1.9 0.12 XP669 2-DEC-2000 20.2 20.1 5 2021 0.4 0.12 XJ701 18-DEC-2000 bad matching? 17.9 17.7 1 762 0.7 0.08 XP701 28-OCT-1999 19.4 19.2 1 1181 0.1 0.10 XJ773 5-OCT-2000 bad matching? 18.4 18.4 2 209 0.6 0.13 XP773 24-JAN-2000

  13. Faint Art. #s #cal dis err Plate Date Comment 20.6 20.7 1 402 0.2 0.16 XJ847 7-FEB-2000 20.2 20.1 1 328 0.3 0.15 XP847 22-NOV-1999 20.9 21.0 1 97 0.5 0.10 XJ880 14-JAN-2001 19.8 19.8 1 71 0.0 0.15 XP880 11-NOV-1999 19.9 19.8 2 272 0.3 0.13 XS016 12-JAN-2000 20.8 20.4 1 579 0.0 0.13 S016 30-JAN-2001 19.8 19.6 1 432 0.1 0.15 XS162 10-DEC-1999 21.0 21.1 1 1003 0.1 0.16 S162 21-DEC-2000 bad matching? 20.1 19.9 1 260 0.2 0.12 XS192 10-DEC-1999 20.8 20.4 2 492 0.0 0.19 S192 20-SEP-2000 19.6 19.5 2 1485 0.1 0.14 XS372 6-FEB-2001 bad matching? 18.1 17.8 1 137 0.0 0.17 S372 8-SEP-1999 21.1 20.9 9 206 0.1 0.15 S430 15-NOV-1999 No red plate 20.6 20.5 1 914 0.1 0.17 S452 5-OCT-2000 No red plate 16.9 16.7 3 155 0.3 0.13 XS468 11-DEC-1999 No faint GSPC2 17.9 17.3 3 473 0.1 0.11 S468 21-SEP-2000 No faint GSPC2 17.4 17.6 6 679 0.0 0.27 S522 1-DEC-1999 * large error 20.1 20.1 1 981 0.1 0.16 ER633 2-FEB-2001 bad matching? 20.9 21.2 1 603 0.1 0.11 S633 29-NOV-2000 18.1 17.8 2 194 0.4 0.19 ER703 6-FEB-2001 18.8 18.9 1 823 0.2 0.12 S703 28-NOV-2000 bad matching? 20.3 20.5 2 1417 0.1 0.15 ER774 12-FEB-2001 bad matching? 21.0 21.1 2 818 0.2 0.13 S774 4-JAN-2001 bad matching?

  14. Star completeness for 1606 pair of plates

  15. All object completeness for 1606 pair of plates

  16. J - F color

  17. J - F color

  18. J - F color

  19. J - F color

  20. J - F color

  21. GSC 2 color distribution as a galactic latitude function

  22. Conclusions • GSC 2.2.01 provide at least 1 calibrated star (photometrical (J,F) and astrometrical) in a 2.5x2.5 minute squares. Dense enough for the telescope operation • The number of fields that need photometric recalibration are less than 5% • The major effort for the next release will be improving the accuracy for the faint end, providing an even product with a very good data quality for astrophysical research • An effort still needs is in the pass band characterization, specially oriented for the final users (Observing tools, proposals planning, etc.) …….may be my homework…

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