Sevilla-Noarbe, I;
Hoyle, B;
Marcha, MJ;
Soumagnac, MT;
Bechtol, K;
Drlica-Wagner, A;
Abdalla, F;
... Walker, AR; + view all
(2018)
Star-galaxy classification in the Dark Energy Survey Y1 data set.
Monthly Notices of the Royal Astronomical Society
, 481
(4)
pp. 5451-5469.
10.1093/mnras/sty2579.
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Abstract
We perform a comparison of different approaches to star–galaxy classification using the broad-band photometric data from Year 1 of the Dark Energy Survey. This is done by performing a wide range of tests with and without external ‘truth’ information, which can be ported to other similar data sets. We make a broad evaluation of the performance of the classifiers in two science cases with DES data that are most affected by this systematic effect: large-scale structure and Milky Way studies. In general, even though the default morphological classifiers used for DES Y1 cosmology studies are sufficient to maintain a low level of systematic contamination from stellar misclassification, contamination can be reduced to the O(1 per cent) level by using multi-epoch and infrared information from external data sets. For Milky Way studies, the stellar sample can be augmented by ∼20 per cent for a given flux limit. Reference catalogues used in this work are available at http://des.ncsa.illinois.edu/releases/y1a1.
| Type: | Article |
|---|---|
| Title: | Star-galaxy classification in the Dark Energy Survey Y1 data set |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty2579 |
| Publisher version: | https://doi.org/10.1093/mnras/sty2579 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Methods: data analysis, Methods: statistical, Techniques: photometric |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10060571 |
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