Calibration%20issues%20for%20OWL

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Calibration issues for OWL

• Faculty Meeting
• October 29th, 2004

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• General easy questions like for 8-10m class
  telescope
• Finding standards that are faint enough
• for photometry, spectroscopy, polarimetry,
  astrometry
• More challenging
• How to calibrate the data (because of the PSF)

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Effect of OWL PSF on standard star field

• ¼ of Vimos calibration field image

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Effect of anisoplanatismHow does it work with 5
guide star (MCAO case)?

• NACO images (courtesy D. Rouan)

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Effect of anisoplanatismHow does it work with 5
guide star (MCAO case)?

• NACO images (courtesy D. Rouan)

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• Faint enough standards will benefit from
  VLT/Keck/Subaru/Large survey programs
• Problem of photometry
• Will we have empty enough fields?
• What precision can we hope for which crowding?
• Need simulations and preparatory work (e.g. MAD)