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

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Presentation transcript:

Photometric Calibration Jorge F. García 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 Color transformations: One pair for each pass band available Range of validate

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

GSC 2 Photometric Calibration: from GSH files

Number of calibrators per field

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

Inconsistence in early reference catalogs version.

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

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

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

GSC 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

FaintArt.#s#caldiserrPlateDateComment XJ0057-JAN XP00523-NOV XJ00719-DEC XP0077-JAN XJ0167-JAN-2000No faint GSPC XP0167-JAN-2000No faint GSPC XJ01720-DEC-1999No faint GSPC XP01714-OCT-1999No faint GSPC XJ0207-JAN XP0207-JAN XJ05720-DEC XP05717-JAN XJ0746-SEP XP0741-NOV-1999No GSPC XJ21919-DEC XP21918-JUL XJ28828-OCT XP28827-DEC-2000No faint GSPC XJ3408-MAR-2000 low galactic latitude XP34021-JUN-2000No faint GSPC XJ4286-JAN XP4286-DEC XJ49323-AUG XP49320-OCT XJ5337-JAN XP5337-DEC XJ59911-JAN XP59916-JAN XJ6531-FEB XP65316-DEC-1999No faint GSPC XJ6606-JAN XP66016-DEC-1999No GSPC XJ6697-JAN XP6692-DEC XJ70118-DEC-2000bad matching? XP70128-OCT XJ7735-OCT-2000bad matching? XP77324-JAN-2000

FaintArt.#s#caldiserrPlateDateComment XJ8477-FEB XP84722-NOV XJ88014-JAN XP88011-NOV XS01612-JAN S01630-JAN XS16210-DEC S16221-DEC-2000bad matching? XS19210-DEC S19220-SEP XS3726-FEB-2001bad matching? S3728-SEP S43015-NOV-1999No red plate S4525-OCT-2000No red plate XS46811-DEC-1999No faint GSPC S46821-SEP-2000No faint GSPC S5221-DEC-1999* large error ER6332-FEB-2001bad matching? S63329-NOV ER7036-FEB S70328-NOV-2000bad matching? ER77412-FEB-2001bad matching? S7744-JAN-2001bad matching?

Star completeness for 1606 pair of plates

All object completeness for 1606 pair of plates

J - F color

GSC 2 color distribution as a galactic latitude function

Conclusions GSC 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…