| Issue |
A&A
Volume 385, Number 3, April III 2002
|
|
|---|---|---|
| Page(s) | 1095 - 1106 | |
| Section | Numerical methods and codes | |
| DOI | https://doi.org/10.1051/0004-6361:20020175 | |
| Published online | 15 April 2002 | |
New algorithms for reducing cross-dispersed echelle spectra*
1
Department of Astronomy and Space Physics Uppsala University, Box 515, 751 20 Uppsala, Sweden
2
Space Telescope Science Institute 3700 San Martin Dr. Baltimore, MD 21218, USA e-mail: valenti@stsci.edu
Corresponding author: N. Piskunov, piskunov@astro.uu.se
Received:
1
November
2001
Accepted:
31
January
2002
We describe advanced image processing algorithms, implemented in a data analysis package for conventional and cross-dispersed echelle spectra. Comparisons with results from other packages illustrate the outstanding quality of the new REDUCE package, particularly in terms of resulting noise level and treatment of CCD defects and cosmic ray spikes. REDUCE can be adapted relatively easily to handle a variety of instrument types, including spectrographs with prism or grating cross-dispersers, possibly fed by a fiber or image slicer, etc. In addition to reduced spectra, an accurate spatial profile is recovered, providing valuable information about the spectrograph PSF and simplifying scattered light corrections.
Key words: instrumentation: spectrographs / methods: data analysis / techniques: spectroscopic
© ESO, 2002
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