A Fast and Portable Reimplementation of Piskunov and Valenti's Optimal-Extraction Algorithm with Improved Cosmic-Ray Removal and Optimal Sky Subtraction

We present a fast and portable reimplementation of Piskunov and Valenti's optimal-extraction algorithm (Piskunov & Valenti 2002) in C/C++ together with full uncertainty propagation, improved cosmic-ray removal, and an optimal background-subtraction algorithm. This reimplementation can be us...

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Published inPublications of the Astronomical Society of the Pacific Vol. 126; no. 936; pp. 170 - 179
Main Authors Ritter, A., Hyde, E. A., Parker, Q. A.
Format Journal Article
LanguageEnglish
Published University of Chicago Press 01.02.2014
Subjects
Algorithms
Astronomical objects
Cosmic rays
IDL lipoproteins
Image reconstruction
Line spectra
Pipelines
Pixels
Spectral reconnaissance
Visible spectrum
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Summary:We present a fast and portable reimplementation of Piskunov and Valenti's optimal-extraction algorithm (Piskunov & Valenti 2002) in C/C++ together with full uncertainty propagation, improved cosmic-ray removal, and an optimal background-subtraction algorithm. This reimplementation can be used with IRAF and most existing data-reduction packages and leads to signal-to-noise ratios close to the Poisson limit. The algorithm is very stable, operates on spectra from a wide range of instruments (slit spectra and fibre feeds), and has been extensively tested for VLT/UVES, ESO/CES, ESO/FEROS, NTT/EMMI, NOT/ALFOSC, STELLA/SES, SSO/WiFeS, and finally, P60/SEDM-IFU data.
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ISSN:0004-6280
1538-3873
DOI:10.1086/675407