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Proceedings Paper

GIANO, the high resolution IR spectrograph of the TNG: geometry of the echellogram and strategies for the 2D reduction of the spectra
Author(s): E. Oliva; N. Sanna; M. Rainer; F. Massi; A. Tozzi; L. Origlia
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Paper Abstract

GIANO is the IR high resolution spectrograph of the TNG. It covers the 950-2450 nm wavelengths range in a single shot at a resolving power of R=50,000. This document describes the first fundamental steps of the data reduction, namely eliminating the curvature of the traces and the tilt of the slit images. These effects can be accurately modeled and corrected using a physical model of the instrument. We find that the curvature and tilt parameters did not vary during the whole lifetime of the instrument. In particular, they were not affected by thermal cycles or by the works performed to mount the spectrometer on its new interface. A similar ab-initio modeling is also applied to the wavelength calibration that can be accurately (0.03 pixel r.m.s.) defined using a minimum number of parameters to fit. This approach is particularly useful when using a calibration source with an irregular wavelengths coverage; e.g. for the U-Ne lamp that has only few lines in the 2000 nm - 2300 nm wavelengths range.

Paper Details

Date Published: 8 July 2018
PDF: 13 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070274 (8 July 2018); doi: 10.1117/12.2309927
Show Author Affiliations
E. Oliva, INAF - Osservatorio Astrofisico di Arcetri (Italy)
N. Sanna, INAF - Osservatorio Astrofisico di Arcetri (Italy)
M. Rainer, INAF - Osservatorio Astrofisico di Arcetri (Italy)
F. Massi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
A. Tozzi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
L. Origlia, INAF - Osservatorio Astronomico di Bologna (Italy)


Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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