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| Paper: |
Non-Negative Matrix Factorization Approach to Sky Subtraction for Optical Spectroscopy |
| Volume: |
541, ADASS XXXIII |
| Page: |
20 |
| Authors: |
Fedor Kolganov; Igor Chilingarian; Kirill Grishin |
| DOI: |
10.26624/IBXN4644 |
| Abstract: |
Numerous sky background subtraction techniques have been developed
since the first implementations of computer-based reduction of spectra. Kurtz & Mink
(2000) described a singular value decomposition-based method which allowed them to
subtract night sky background from multi-fiber spectroscopic observations without any
additional sky observations. We hereby take this approach one step further with usage
of non-negative matrix factorization instead of principal component analysis and generalize it to 2D spectra. This allows us to generate approximately 10 times as many valid
eigenspectra because of non-negativity. We apply our method to “short”-slit spectra of
low-mass galaxies originating from intermediate-resolution Echelle spectrographs (ESI at Keck, MagE at Magellan, X-Shooter at the VLT) when sources fill the entire slit. We
demonstrate its efficiency even when no offset sky observations were collected. |
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