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GSC2 @ ESO: Applications to the ESO Imaging Survey and to the VLT

GSC2 @ ESO: Applications to the ESO Imaging Survey and to the VLT. R.Mignani (ESO) 7th GSC2 Meeting 2001. ESO Imaging Survey (www.eso.org/eis). The ESO Imaging Survey (EIS) is a pilot project in preparation for VST (2003) and VISTA (2004). ESO Imaging Survey.

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GSC2 @ ESO: Applications to the ESO Imaging Survey and to the VLT

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  1. GSC2 @ ESO:Applications to the ESO Imaging Survey and to the VLT R.Mignani (ESO) 7th GSC2 Meeting 2001

  2. ESO Imaging Survey (www.eso.org/eis) • The ESO Imaging Survey (EIS) is a pilot project in preparation for VST (2003) and VISTA (2004)

  3. ESO Imaging Survey • EIS carried on with WFI@2.2m (34x33 arcmin 8 chips mosaic CCD) • GSC2 is now used in the EIS pipeline for astrometric calibration of the survey fields • The Deep Public Survey (DPS) (started fall ‘99)covers 3 (0.5x2 deg) patchesin UBVRI + JKs, including Chandra Deep Field South • EIS CDFS observations relased early this year (Vandame et al. 2001 A&A- accepted; Arnouts et al. 2001 A&A in press)- test release of GSC2.1 used (<0.1” rms)- data will be rereleased asap with GSC2.2 astrometry • The Pre-FLAMES Survey (PFS)covers 160 (0.5x0.5 deg) fields in BVI - GCs, OCs, LMC, SMC, GB ... targets for the SV of FLAMES@KUEYEN • The GOODS/ESO observations of the CDFS tbd with WFI@2.2m, ISAAC@Antu

  4. GOODS/ESO coverage

  5. EIS coverage

  6. NGC1904

  7. FLAMES@KUEYEN • FLAMES is a Fiber system feeding GIRAFFE and UVES MOS spectrographs @VLT/KUEYEN (Commissioning end of 2001) • GIRAFFE in MEDUSA mode is fed by 130 fibers (1.2” diam) • Automatic ACQ • Very stringent requirements on the astrometry (< 0.2”) • Challenge for the GSC2 • First data released so far: • 4 OCs: Berkeley 20, NGC 2477, NGC2506, M67 • 2 SMC Fields: NGC330,NGC346 • Momany et al 2001 A&A-in press

  8. USNOA2.0 vs GSC2.2Test computed wrt the M67 field

  9. RA,DEC residuals vs RA,DEC

  10. RA,DEC residuals vs mag

  11. USNOA2.0&GSC2.2 vs RefAstrometry compared vs Reference astrometry of M67 field (Girard et al. 1989 AJ 98, 227)

  12. Landolt vs GSC2 • Visual inspections on the DSS have shown that Landolt stars are off from the nominal positions (Landolt 1992 AJ 104,340) • In some cases, differences up to few arcmin have been found • Unknown PMs (to be measured) • Errors in the original Astrometry • Pbs for automatic recognition of standards and photom pipelines • Reassessment of Landolt coo in the GSC2 system • Interactive ID interface set up with SKYCAT • Possible variables found • The revised Landolt cat being published

  13. Conclusions • ESO is waiting for 100% sky coverage before using routinely GSC2 for telescope operations • EIS is GSC2 “best customer” with GSC2 used in ALL EIS Surveys • GSC2 accuracy well within the requirements • GSC2 is valuable support for FLAMES users • GSC2 used to set a new astrometric standard for Landolt stars --> important for pipeline photometric calibrations ... not only EIS but also VLT

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