Star–galaxy classification in the Dark Energy Survey Y1 data set - Sorbonne Université
Journal Articles Monthly Notices of the Royal Astronomical Society Year : 2018

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

I. Sevilla-Noarbe
  • Function : Author
B. Hoyle
  • Function : Author
M.J. Marchã
  • Function : Author
M.T. Soumagnac
  • Function : Author
K. Bechtol
  • Function : Author
A. Drlica-Wagner
  • Function : Author
F. Abdalla
  • Function : Author
J. Aleksić
  • Function : Author
C. Avestruz
  • Function : Author
E. Balbinot
  • Function : Author
M. Banerji
  • Function : Author
C. Bonnett
  • Function : Author
R. Brunner
  • Function : Author
M. Carrasco-Kind
  • Function : Author
A. Choi
  • Function : Author
T. Giannantonio
  • Function : Author
E. Kim
  • Function : Author
O. Lahav
  • Function : Author
B. Moraes
  • Function : Author
B. Nord
  • Function : Author
A.J. Ross
  • Function : Author
E.S. Rykoff
  • Function : Author
B. Santiago
  • Function : Author
E. Sheldon
  • Function : Author
K. Wei
  • Function : Author
W. Wester
  • Function : Author
B. Yanny
  • Function : Author
T. Abbott
  • Function : Author
S. Allam
  • Function : Author
D. Brooks
  • Function : Author
A. Carnero-Rosell
  • Function : Author
J. Carretero
  • Function : Author
C. Cunha
  • Function : Author
L. da Costa
C. Davis
  • Function : Author
J. de Vicente
  • Function : Author
S. Desai
  • Function : Author
P. Doel
  • Function : Author
E. Fernandez
  • Function : Author
B. Flaugher
  • Function : Author
J. Frieman
  • Function : Author
J. Garcia-Bellido
  • Function : Author
E. Gaztanaga
  • Function : Author
D. Gruen
  • Function : Author
R. Gruendl
  • Function : Author
J. Gschwend
  • Function : Author
G. Gutierrez
  • Function : Author
D.L. Hollowood
  • Function : Author
K. Honscheid
  • Function : Author
D. James
  • Function : Author
T. Jeltema
  • Function : Author
D. Kirk
  • Function : Author
E. Krause
  • Function : Author
K. Kuehn
  • Function : Author
T.S. Li
  • Function : Author
M. Lima
  • Function : Author
M.A.G. Maia
  • Function : Author
M. March
  • Function : Author
R.G. Mcmahon
  • Function : Author
F. Menanteau
  • Function : Author
R. Miquel
  • Function : Author
R.L.C. Ogando
  • Function : Author
A.A. Plazas
  • Function : Author
E. Sanchez
  • Function : Author
V. Scarpine
  • Function : Author
R. Schindler
  • Function : Author
M. Schubnell
  • Function : Author
M. Smith
  • Function : Author
R.C. Smith
  • Function : Author
M. Soares-Santos
  • Function : Author
F. Sobreira
  • Function : Author
E. Suchyta
  • Function : Author
M.E.C. Swanson
  • Function : Author
G. Tarle
  • Function : Author
D. Thomas
  • Function : Author
D.L. Tucker
  • Function : Author
A.R. Walker
  • Function : Author

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 |${\sim }20{{\ \rm per\ cent}}$| for a given flux limit. Reference catalogues used in this work are available at http://des.ncsa.illinois.edu/releases/y1a1.
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Dates and versions

hal-01797137 , version 1 (11-11-2024)

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I. Sevilla-Noarbe, B. Hoyle, M.J. Marchã, M.T. Soumagnac, K. Bechtol, et al.. Star–galaxy classification in the Dark Energy Survey Y1 data set. Monthly Notices of the Royal Astronomical Society, 2018, 481 (4), pp.5451-5469. ⟨10.1093/mnras/sty2579⟩. ⟨hal-01797137⟩
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