| Issue |
A&A
Volume 418, Number 2, May I 2004
|
|
|---|---|---|
| Page(s) | 771 - 780 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20040055 | |
| Published online | 09 April 2004 | |
Analysis of spectro-imaging data using the Karhunen-Loève expansion: Application to NGC 7027 in the infrared
1
Dpt Cassiopée, CNRS UMR-6202, Observatoire de la Côte d'Azur, BP 4229, 06304 Nice Cedex 4, France
2
ESO, Alonso de Cordova 3107, Vitacura Santiago 19, Chile
3
Institut d'Astrophysique de Paris, 98 bis Bd Arago, 75014 Paris, France
Corresponding author: D. Mékarnia, mekarnia@obs-nice.fr
Received:
22
January
2003
Accepted:
15
January
2004
A method, based on the Karhunen-Loève (KL) transformation, to improve the signal-to-noise ratio of a multispectral data cube is presented. As an illustration we have re-analyzed near-infrared multi-spectral images of the young planetary nebula NGC 7027 previously observed by Cox et al. ([CITE]). Our KL analysis clearly shows an enhancement of both spectral and spatial information, particularly in the case of low signal-to-noise ratio images.
Key words: methods: data analysis / planetary nebulae: individual: NGC 7027
© ESO, 2004
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