| Issue |
A&A
Volume 431, Number 3, March I 2005
|
|
|---|---|---|
| Page(s) | 1167 - 1175 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20041601 | |
| Published online | 16 February 2005 | |
Evolution strategies applied to the problem of line profile decomposition in QSO spectra
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany e-mail: [rquast;rbaade;dreimers]@hs.uni-hamburg.de
Received:
5
July
2004
Accepted:
16
October
2004
We describe the decomposition of QSO absorption line ensembles by applying an evolutionary forward modelling technique. The modelling is optimized using an evolution strategy (ES) based on a novel concept of completely derandomized self-adaption. The algorithm is described in detail. Its global optimization performance in decomposing a series of simulated test spectra is compared to that of classical deterministic algorithms. Our comparison demonstrates that the ES is a highly competitive algorithm capable of calculating the optimal decomposition without requiring any particular initialization.
Key words: methods: data analysis / methods: numerical / galaxies: quasars: absorption lines
© ESO, 2005
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