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METIS is a mid-infrared instrument proposed for the European Extremely LargeTelescope (E-ELT). It is designed to provide imaging and spectroscopiccapabilities in the 3 - 14 micron region up to a spectral resolution of 1.One of the novel concepts of METIS is that of a high-resolution integral fieldspectrograph (IFS) for a diffraction-limited mid-IR instrument. While thisconcept has many scientific and operational advantages over a long-slitspectrograph, one drawback is that the spectral resolution changes over thefield of view. This has an impact on the procedures to correct for telluricabsorption lines imprinted on the science spectra. They are a major obstacle inthe quest to maximize spectral fidelity, the ability to distinguish a weakspectral feature from the continuum. The classical technique of division by astandard star spectrum, observed in a single IFS spaxel, cannot simply beapplied to all spaxels, because the spectral resolution changes from spaxel tospaxel. Here we present and discuss possible techniques of telluric linecorrection of METIS IFS spectra, including the application of synthetic modelspectra of telluric transmission, to maximize spectral fidelity.

Correcting METIS spectra for telluric absorption to maximize spectral fidelity