Star–galaxy classification in the Dark Energy Survey Y1 data set

Desai, Shantanu and Sevilla-Noarbe, I and Hoyle, B and et al, . (2018) Star–galaxy classification in the Dark Energy Survey Y1 data set. Monthly Notices of the Royal Astronomical Society, 481 (4). pp. 5451-5469. ISSN 0035-8711

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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.

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IITH Creators:
IITH CreatorsORCiD
Desai, Shantanuhttp://orcid.org/0000-0002-0466-3288
Item Type: Article
Uncontrolled Keywords: Indexed in WoS
Subjects: Physics
Divisions: Department of Physics
Depositing User: Library Staff
Date Deposited: 23 Oct 2019 05:24
Last Modified: 23 Oct 2019 05:24
URI: http://raiith.iith.ac.in/id/eprint/6652
Publisher URL: https://doi.org/10.1093/mnras/sty2579
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