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Proceedings Paper

mCorrecting METIS spectra for telluric absorption to maximize spectral fidelity
Author(s): Stefan Uttenthaler; Klaus M. Pontoppidan; Andreas Seifahrt; Sarah Kendrew; Joris A. D. L. Blommaert; Eric J. Pantin; Bernhard R. Brandl; Frank J. Molster; Lars Venema; Rainer Lenzen; Philip Parr-Burman; Ralf Siebenmorgen
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Paper 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.

Paper Details

Date Published: 20 July 2010
PDF: 11 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77357A (20 July 2010); doi: 10.1117/12.856697
Show Author Affiliations
Stefan Uttenthaler, Katholieke Univ. Leuven (Belgium)
Klaus M. Pontoppidan, California Institute of Technology (United States)
Andreas Seifahrt, Univ. of California, Davis (United States)
Sarah Kendrew, Leiden Observatory, Leiden Univ. (Netherlands)
Joris A. D. L. Blommaert, Katholieke Univ. Leuven (Belgium)
Eric J. Pantin, DSM/IRFU, Service d'Astrophysique, CEA Saclay (France)
Bernhard R. Brandl, Leiden Observatory, Leiden Univ. (Netherlands)
Frank J. Molster, NOVA (Netherlands)
Lars Venema, NOVA-ASTRON (Netherlands)
Rainer Lenzen, Max-Planck-Institut für Astronomie (Germany)
Philip Parr-Burman, UK Astronomy Technology Ctr., The Royal Observatory Edinburgh (United Kingdom)
Ralf Siebenmorgen, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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