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A catalogue of structural and morphological measurements for DES Y1

A catalogue of structural and morphological measurements for DES Y1
A catalogue of structural and morphological measurements for DES Y1

We present a structural and morphological catalogue for 45 million objects selected from the first year data of the Dark Energy Survey (DES). Single Sérsic fits and non-parametric measurements are produced for g, r, and i filters. The parameters from the best-fitting Sérsic model (total magnitude, half-light radius, Sérsic index, axis ratio, and position angle) are measured with GALFIT; the non-parametric coefficients (concentration, asymmetry, clumpiness, Gini, M20) are provided using the Zurich Estimator of Structural Types (ZEST+). To study the statistical uncertainties, we consider a sample of state-of-the-art image simulations with a realistic distribution in the input parameter space and then process and analyse them as we do with real data: this enables us to quantify the observational biases due to PSF blurring and magnitude effects and correct themeasurements as a function ofmagnitude, galaxy size, Sérsic index (concentration for the analysis of the non-parametric measurements) and ellipticity. We present the largest structural catalogue to date: we find that accurate and complete measurements for all the structural parameters are typically obtained for galaxies with SEXTRACTOR MAG AUTO I ≤ 21. Indeed, the parameters in the filters i and r can be overall well recovered up to MAG AUTO ≤ 21.5, corresponding to a fitting completeness of ~90 per cent below this threshold, for a total of 25million galaxies. The combination of parametric and non-parametric structural measurements makes this catalogue an important instrument to explore and understand how galaxies form and evolve. The catalogue described in this paper will be publicly released alongside the DES collaboration Y1 cosmology data products at the following URL: https://des.ncsa.illinois.edu/releases.

Catalogues, Galaxies: general, Galaxy evolution, Galaxy structure, Surveys
0035-8711
2018-2040
Tarsitano, F.
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Hartley, W. G.
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Amara, A.
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Bluck, A.
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Bruderer, C.
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Carollo, M.
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Conselice, C.
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Melchior, P.
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Moraes, B.
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Refregier, A.
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Sevilla-Noarbe, I.
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Woo, J.
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Abbott, T. M.C.
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Allam, S.
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Annis, J.
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Avila, S.
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Banerji, M.
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Bertin, E.
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Brooks, D.
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Burke, D. L.
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Carnero Rosell, A.
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Carrasco Kind, M.
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Carretero, J.
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Cunha, C. E.
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D'Andrea, C. B.
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da Costa, L. N.
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Davis, C.
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De Vicente, J.
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Desai, S.
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Doel, P.
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Estrada, J.
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Frieman, J.
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García-Bellido, J.
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Gruen, D.
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Gruendl, R. A.
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Gutierrez, G.
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Hollowood, D.
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Honscheid, K.
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James, D. J.
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Jeltema, T.
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Krause, E.
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Kuehn, K.
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Kuropatkin, N.
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Lahav, O.
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Maia, M. A.G.
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Sanchez, E.
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Smith, M.
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Smith, R. C.
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Thomas, D.
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Walker, A. R.
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DES Collaboration
Tarsitano, F.
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Hartley, W. G.
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Amara, A.
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Bluck, A.
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Bruderer, C.
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Carollo, M.
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Conselice, C.
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Melchior, P.
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Moraes, B.
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Refregier, A.
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Sevilla-Noarbe, I.
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Woo, J.
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Abbott, T. M.C.
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Allam, S.
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Annis, J.
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Avila, S.
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Banerji, M.
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Bertin, E.
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Brooks, D.
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Burke, D. L.
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Carnero Rosell, A.
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Carrasco Kind, M.
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Carretero, J.
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Cunha, C. E.
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D'Andrea, C. B.
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da Costa, L. N.
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Davis, C.
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De Vicente, J.
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Desai, S.
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Doel, P.
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Estrada, J.
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Frieman, J.
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García-Bellido, J.
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Gruen, D.
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Gruendl, R. A.
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Gutierrez, G.
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Hollowood, D.
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Honscheid, K.
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James, D. J.
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Jeltema, T.
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Krause, E.
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Kuehn, K.
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Kuropatkin, N.
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Lahav, O.
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Maia, M. A.G.
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Sanchez, E.
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Smith, M.
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Smith, R. C.
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Thomas, D.
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Walker, A. R.
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Tarsitano, F., Hartley, W. G., Amara, A., Bluck, A., Bruderer, C., Carollo, M., Conselice, C., Melchior, P., Moraes, B., Refregier, A., Sevilla-Noarbe, I., Woo, J., Abbott, T. M.C., Allam, S., Annis, J., Avila, S., Banerji, M., Bertin, E., Brooks, D., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Carretero, J., Cunha, C. E., D'Andrea, C. B., da Costa, L. N., Davis, C., De Vicente, J., Desai, S., Doel, P., Estrada, J., Frieman, J., García-Bellido, J., Gruen, D., Gruendl, R. A., Gutierrez, G., Hollowood, D., Honscheid, K., James, D. J., Jeltema, T., Krause, E., Kuehn, K., Kuropatkin, N., Lahav, O., Maia, M. A.G., Sanchez, E., Smith, M., Smith, R. C., Thomas, D. and Walker, A. R. , DES Collaboration (2018) A catalogue of structural and morphological measurements for DES Y1. Monthly Notices of the Royal Astronomical Society, 481 (2), 2018-2040. (doi:10.1093/MNRAS/STY1970).

Record type: Article

Abstract

We present a structural and morphological catalogue for 45 million objects selected from the first year data of the Dark Energy Survey (DES). Single Sérsic fits and non-parametric measurements are produced for g, r, and i filters. The parameters from the best-fitting Sérsic model (total magnitude, half-light radius, Sérsic index, axis ratio, and position angle) are measured with GALFIT; the non-parametric coefficients (concentration, asymmetry, clumpiness, Gini, M20) are provided using the Zurich Estimator of Structural Types (ZEST+). To study the statistical uncertainties, we consider a sample of state-of-the-art image simulations with a realistic distribution in the input parameter space and then process and analyse them as we do with real data: this enables us to quantify the observational biases due to PSF blurring and magnitude effects and correct themeasurements as a function ofmagnitude, galaxy size, Sérsic index (concentration for the analysis of the non-parametric measurements) and ellipticity. We present the largest structural catalogue to date: we find that accurate and complete measurements for all the structural parameters are typically obtained for galaxies with SEXTRACTOR MAG AUTO I ≤ 21. Indeed, the parameters in the filters i and r can be overall well recovered up to MAG AUTO ≤ 21.5, corresponding to a fitting completeness of ~90 per cent below this threshold, for a total of 25million galaxies. The combination of parametric and non-parametric structural measurements makes this catalogue an important instrument to explore and understand how galaxies form and evolve. The catalogue described in this paper will be publicly released alongside the DES collaboration Y1 cosmology data products at the following URL: https://des.ncsa.illinois.edu/releases.

Full text not available from this repository.

More information

Accepted/In Press date: 20 July 2018
Published date: 23 July 2018
Keywords: Catalogues, Galaxies: general, Galaxy evolution, Galaxy structure, Surveys

Identifiers

Local EPrints ID: 429387
URI: https://eprints.soton.ac.uk/id/eprint/429387
ISSN: 0035-8711
PURE UUID: c8eadccf-a6ac-481e-907b-794d7d78253b
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432

Catalogue record

Date deposited: 27 Mar 2019 17:30
Last modified: 17 May 2019 00:30

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Contributors

Author: F. Tarsitano
Author: W. G. Hartley
Author: A. Amara
Author: A. Bluck
Author: C. Bruderer
Author: M. Carollo
Author: C. Conselice
Author: P. Melchior
Author: B. Moraes
Author: A. Refregier
Author: I. Sevilla-Noarbe
Author: J. Woo
Author: T. M.C. Abbott
Author: S. Allam
Author: J. Annis
Author: S. Avila
Author: M. Banerji
Author: E. Bertin
Author: D. Brooks
Author: D. L. Burke
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: J. Carretero
Author: C. E. Cunha
Author: C. B. D'Andrea
Author: L. N. da Costa
Author: C. Davis
Author: J. De Vicente
Author: S. Desai
Author: P. Doel
Author: J. Estrada
Author: J. Frieman
Author: J. García-Bellido
Author: D. Gruen
Author: R. A. Gruendl
Author: G. Gutierrez
Author: D. Hollowood
Author: K. Honscheid
Author: D. J. James
Author: T. Jeltema
Author: E. Krause
Author: K. Kuehn
Author: N. Kuropatkin
Author: O. Lahav
Author: M. A.G. Maia
Author: E. Sanchez
Author: M. Smith ORCID iD
Author: R. C. Smith
Author: D. Thomas
Author: A. R. Walker

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