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Correcting METIS spectra for telluric absorption to maximize spectral fidelity

Uttenthaler, Stefan and Pontoppidan, Klaus M. and Seifahrt, Andreas and Kendrew, Sarah and Blommaert, Joris A. D. L. and Pantin, Eric J. and Brandl, Bernhard R. and Molster, Frank J. and Venema, Lars and Lenzen, Rainer and Parr-Burman, Philip and Siebenmorgen, Ralf (2010) Correcting METIS spectra for telluric absorption to maximize spectral fidelity. In: Ground-based and Airborne Instrumentation for Astronomy III. Proceedings of SPIE. No.7735. Society of Photo-Optical Instrumentation Engineers , Bellingham, WA, Art. No. 77357A. ISBN 9780819482259.

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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.

Item Type:Book Section
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Pontoppidan, Klaus M.0000-0001-7552-1562
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.
Funding AgencyGrant Number
Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)G.0470.07
Subject Keywords:ELT; METIS; Integral Field Spectroscopy; near-infrared; telluric correction; spectral fidelity
Series Name:Proceedings of SPIE
Issue or Number:7735
Record Number:CaltechAUTHORS:20161107-143141197
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Official Citation: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; Correcting METIS spectra for telluric absorption to maximize spectral fidelity. Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77357A (July 20, 2010); doi:10.1117/12.856697
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71778
Deposited By: Tony Diaz
Deposited On:07 Nov 2016 22:43
Last Modified:03 Oct 2019 16:11

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