Correcting METIS spectra for telluric absorption to maximize spectral fidelity
Contributors
Abstract
METIS is a mid-infrared instrument proposed for the European Extremely Large Telescope. It is designed to provide imaging and spectroscopic capabilities in the 3 - 14 micron region up to a spectral resolution of 100000. One of the novel concepts of METIS is that of a high-resolution integral field spectrograph for a diffraction-limited mid-IR instrument. While this concept has many scientific and operational advantages over a long-slit spectrograph, one drawback is that the spectral resolution changes over the field of view. This has an impact on the procedures to correct for telluric absorption lines imprinted on the science spectra. They are a major obstacle in the quest to maximize spectral fidelity, the ability to distinguish a weak spectral feature from the continuum. The classical technique of division by a standard star spectrum, observed in a single IFS spaxel, cannot simply be applied to all spaxels, because the spectral resolution changes from spaxel to spaxel. Here we present and discuss possible techniques of telluric line correction of METIS IFS spectra, including the application of synthetic model spectra of telluric transmission, to maximize spectral fidelity.
Additional Information
© 2010 SPIE. This research is based on observations at the Very Large Telescope of the European Southern Observatory, Cerro Paranal/Chile, under Programs 081.D-0669, 081.D-0702, 383.D-0894, and 179.C-0151. SU acknowledges support from the Fund for Scientific Research of Flanders (FWO) under grant number G.0470.07.Attached Files
Published - 77357A_1.pdf
Files
77357A_1.pdf
Additional details
Identifiers
- Eprint ID
- 71778
- Resolver ID
- CaltechAUTHORS:20161107-143141197
Funding
- Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)
- G.0470.07
Dates
- Created
-
2016-11-07Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field
Caltech Custom Metadata
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 7735