1. The VIMOS IFU Pipeline
Carlo Izzo

2. The VIMOS IFU

3. The VIMOS IFU
LR mode
HR and MR mode

4. The VIMOS IFU

5. Flat fields

6. IFU pipeline - historical background
The IFU pipeline was delivered by the VIRMOS Consortium on June No documentation was available, and only LR spectral observations were supported at the time. The IFU DRS was also declared not to be suitable for automatic data reduction.
On July 2003 it was decided to rewrite the IFU pipeline from scratch. Valuable suggestions about IFU data reduction issues were provided by Eric Emsellem and Arlette Rousset-Pecontal (Centre de Recherche Astronomique de Lyon), and by Martin Roth (Astro-physikalisches Institut Potsdam).
The new ESO VIMOS pipeline, based on the CPL, was designed and developed in about eight months. It was delivered to Paranal on March 2004, and to the user community on July 2004.

7. VIMOS IFU pipeline recipes
vmifucalib:
Input: a sequence of flat field and one arc lamp exposures.
Produces the extraction mask (spectral tracing + wavelength calibration), and the relative transmission correction.
vmifuscience:
Input: scientific exposure, extraction mask, and relative transmission correction. Optionally, a spectral response curve.
Produces the extracted, wavelength calibrated, transmission corrected spectra, and a reconstructed image of the field-of-view. Optionally, a relative flux correction can be applied.
vmifustandard:
Analogous to vmifuscience, it produces also a spectral response curve.

8. vmifucalib
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9. vmifucalib

10. vmifuscience

11. vmifucalib
Extracted scientific spectra
Reconstructed FOV image

12. Spectral extraction
(pixel)

13. Fiber profile

14. Fiber profile
HR blue
HR red
(pixel)

15. Problems
Instrument instability ruins the scientific reduction online, and enforces the acquisition of night calibrations
Contamination between multiplexed spectra may occasionally prevent an accurate tracing and a correct fiber identification
The extraction mask cannot be aligned to a “dark” scientific exposure

16. It would be nice… WCS on reconstructed images of the field-of-view
Alignment and sum of jittered exposures
Optimal extraction
More interactivity

17. THE END