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Research at St Andrews

The VIMOS Public Extragalactic Redshift Survey (VIPERS). PCA-based automatic cleaning and reconstruction of survey spectra

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Author(s)

A. Marchetti, B. Garilli, B. R. Granett, L. Guzzo, A. Iovino, M. Scodeggio, M. Bolzonella, S. de la Torre, U. Abbas, C. Adami, D. Bottini, A. Cappi, O. Cucciati, I. Davidzon, P. Franzetti, A. Fritz, J. Krywult, V. Le Brun, O. Le Fèvre, D. Maccagni & 17 more K. Małek, F. Marulli, M. Polletta, A. Pollo, L. A. M. Tasca, R. Tojeiro, D. Vergani, A. Zanichelli, S. Arnouts, J. Bel, E. Branchini, J. Coupon, G. De Lucia, O. Ilbert, T. Moutard, L. Moscardini, G. Zamorani

School/Research organisations

Abstract

Context. Identifying spurious reduction artefacts in galaxy spectra is a challenge for large surveys.

Aims. We present an algorithm for identifying and repairing spurious residual features in sky-subtracted galaxy spectra by using data from the VIMOS Public Extragalactic Redshift Survey (VIPERS) as a test case.

Methods. The algorithm uses principal component  analysis (PCA) applied to the galaxy spectra in the observed frame to identify sky line residuals imprinted at characteristic wavelengths. We further model the galaxy spectra in the rest-frame using PCA to estimate the most probable continuum in the corrupted spectral regions, which are then repaired.

Results. We apply the method to ~90 000 spectra from the VIPERS survey and compare the results with a subset for which careful editing was performed by hand. We find that the automatic technique reproduces the time-consuming manual cleaning in a uniform and objective manner across a large data sample. The mask data  products produced in this work are released together with the VIPERS second public data release (PDR-2).
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Original languageEnglish
Article numberA54
Number of pages9
JournalAstronomy & Astrophysics
Volume600
Early online date29 Mar 2017
DOIs
Publication statusPublished - Apr 2017

    Research areas

  • Galaxies: statistics, Surveys, Methods: statistical

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