Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS

S. Jouvel; T. Delubac; J. Comparat; H. Camacho; A. Carnero; F. B. Abdalla; J. P. Kneib; A. Merson; M. Lima; F. Sobreira; Luiz da Costa; F. Prada; G. B. Zhu; A. Benoit-Levy; A. De La Macora; N. Kuropatkin; H. Lin; T. M.C. Abbott; S. Allam; M. Banerji; E. Bertin; D. Brooks; D. Capozzi; M. Carrasco Kind; J. Carretero; F. J. Castander; C. E. Cunha; S. Desai; P. Doel; T. F. Eifler; J. Estrada; A. Fausti Neto; B. Flaugher; P. Fosalba; J. Frieman; E. Gaztanaga; D. W. Gerdes; D. Gruen; R. A. Gruendl; G. Gutierrez; K. Honscheid; D. J. James; K. Kuehn; O. Lahav; T. S. Li; M. A.G. Maia; M. March; J. L. Marshall; R. Miquel; R. Ogando; W. J. Percival; A. A. Plazas; K. Reil; A. K. Romer; A. Roodman; E. S. Rykoff; M. Sako; E. Sanchez; B. Santiago; V. Scarpine; I. Sevilla-Noarbe; M. Soares-Santos; E. Suchyta; G. Tarle; J. Thaler; D. Thomas; A. Walker; Y. Zhang; J. Brownstein

doi:10.1093/mnras/stx163

Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS

S. Jouvel, T. Delubac, J. Comparat, H. Camacho, A. Carnero, F. B. Abdalla, J. P. Kneib, A. Merson, M. Lima, F. Sobreira, Luiz da Costa, F. Prada, G. B. Zhu, A. Benoit-Levy, A. De La Macora, N. Kuropatkin, H. Lin, T. M.C. Abbott, S. Allam, M. BanerjiE. Bertin, D. Brooks, D. Capozzi, M. Carrasco Kind, J. Carretero, F. J. Castander, C. E. Cunha, S. Desai, P. Doel, T. F. Eifler, J. Estrada, A. Fausti Neto, B. Flaugher, P. Fosalba, J. Frieman, E. Gaztanaga, D. W. Gerdes, D. Gruen, R. A. Gruendl, G. Gutierrez, K. Honscheid, D. J. James, K. Kuehn, O. Lahav, T. S. Li, M. A.G. Maia, M. March, J. L. Marshall, R. Miquel, R. Ogando, W. J. Percival, A. A. Plazas, K. Reil, A. K. Romer, A. Roodman, E. S. Rykoff, M. Sako, E. Sanchez, B. Santiago, V. Scarpine, I. Sevilla-Noarbe, M. Soares-Santos, E. Suchyta, G. Tarle, J. Thaler, D. Thomas, A. Walker, Y. Zhang, J. Brownstein

Workflow Systems

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

We present the results of the first observations of the emission line galaxies (ELG) of the extended Baryon Oscillation Spectroscopic Survey. From the total 9000 targets, 4600 have been selected from the Dark Energy Survey (DES). In this subsample, the total success rate for redshifts between 0.6 and 1.2 is 71 and 68 per cent for a bright and a faint samples, respectively, including redshifts measured from a single strong emission line. The mean redshift is 0.80 for the bright and 0.87 for the faint sample, while the percentage of unknown redshifts is 15 and 13 per cent, respectively. In both cases, the star contamination is lower than 2 per cent. We evaluate how well the ELG redshifts are measured using the target selection photometry and validating with the spectroscopic redshifts measured by eBOSS. We explore different techniques to reduce the photometric redshift outliers fraction with a comparison between the template fitting, the neural networks and the random forest methods. Finally, we study the clustering properties of the DES SVA1 ELG samples. We select only the most secure spectroscopic redshift in the redshift range 0.6 < z < 1.2, leading to a mean redshift for the bright and faint sample of 0.85 and 0.90, respectively. We measure the projected angular correlation function and obtain a galaxy bias averaging on scales from 1 to 10 Mpc h^-1 of 1.58 ± 0.10 for the bright sample and 1.65 ± 0.12 for the faint sample. These values are representative of a galaxy population with M_B - log(h) < -20.5, in agreement with what we measure by fitting galaxy templates to the photometric data.

Original language	English
Pages (from-to)	2771-2790
Number of pages	20
Journal	Monthly Notices of the Royal Astronomical Society
Volume	469
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stx163
State	Published - Aug 11 2017

Funding

This paper has gone through internal review by the DES collaboration. We are grateful for the extraordinary contributions of our CTIO colleagues and the DECam Construction, Commissioning and Science Verification teams in achieving the excellent instrument and telescope conditions that have made this work possible. The success of this project also relies critically on the expertise and dedication of the DES Data Management group. Funding for the DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, Financiadora de Estudos e Pro-jetos, Fundaca o Carlos Chagas Filho de Amparo \u00E0 Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Cient\u00EDfico e Tecnologico and the Minis\u00E9rio da Ciencia e Tecnolo- gia, the Deutsche Forschungsgemeinschaft and the Collaborating Institutions in the Dark Energy Survey. The authors thank Molly Swanson for her great work and help on MANGLE. HC is supported by Conselho Nacional de Desen-volvimento Cient\u00EDfico e Tecnol\u00F3gico (CNPq). AC thanks Fer-nando de Simoni for useful discussions. AC acknowledges financial support provided by the Programa de Apoio ao P\u00F3s-Doutorado (PAPDRJ)/Coordenac\u00B8\u00E3o de Aperfeic\u00B8oamento de Pessoal de N\u00EDvel Superior (CAPES)/Fundac\u00B8\u00E3o de Amparo \u00E0 Pesquisa do Estado do Rio de Janeiro (FAPER) Fellowship. ML is partially supported by Fundac\u00B8\u00E3o de Amparo \u00E0 Pesquisa do Estado de S\u00E3o Paulo (FAPESP) and CNPq. FBA acknowledges the support of the Royal society via a RS University Research Fellowship. FS acknowledges financial support provided by CAPES under contract No. 3171-13-2. JC and FP acknowledge support from the Spanish Ministerio de Ciencia e Innovaci\u00F3n (MICINN) grant MultiDark CSD2009-00064, Ministe-rio de Econom\u00EDa, Industria y Competitividad (MINECO) Severo Ochoa Programme grant SEV-2012-0249 and grant AYA2014-60641-C2-1-P. FP wish to thank the Lawrence Berkeley National Laboratory for the hospitality and the Spanish MEC Salvador de Madariaga program, Ref. PRX14/00444. The DES data management system is supported by the National Science Foundation under Grant Number AST1138766. The DES participants from Spanish institutions are partially supported by MINECO under grants AYA201239559, ESP2013-48274, FPA2013-47986, and Centro de Excelencia Severo Ochoa SEV-2012-0234, some of which include ERDF funds from the European Union. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS web site is www.sdss.org.

Keywords

Cosmology: observations
Surveys

Access to Document

10.1093/mnras/stx163

Cite this

Jouvel, S., Delubac, T., Comparat, J., Camacho, H., Carnero, A., Abdalla, F. B., Kneib, J. P., Merson, A., Lima, M., Sobreira, F., da Costa, L., Prada, F., Zhu, G. B., Benoit-Levy, A., De La Macora, A., Kuropatkin, N., Lin, H., Abbott, T. M. C., Allam, S., ... Brownstein, J. (2017). Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS. Monthly Notices of the Royal Astronomical Society, 469(3), 2771-2790. https://doi.org/10.1093/mnras/stx163

@article{df1fa5866914427eb8029cf2c84797e8,

title = "Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS",

abstract = "We present the results of the first observations of the emission line galaxies (ELG) of the extended Baryon Oscillation Spectroscopic Survey. From the total 9000 targets, 4600 have been selected from the Dark Energy Survey (DES). In this subsample, the total success rate for redshifts between 0.6 and 1.2 is 71 and 68 per cent for a bright and a faint samples, respectively, including redshifts measured from a single strong emission line. The mean redshift is 0.80 for the bright and 0.87 for the faint sample, while the percentage of unknown redshifts is 15 and 13 per cent, respectively. In both cases, the star contamination is lower than 2 per cent. We evaluate how well the ELG redshifts are measured using the target selection photometry and validating with the spectroscopic redshifts measured by eBOSS. We explore different techniques to reduce the photometric redshift outliers fraction with a comparison between the template fitting, the neural networks and the random forest methods. Finally, we study the clustering properties of the DES SVA1 ELG samples. We select only the most secure spectroscopic redshift in the redshift range 0.6 < z < 1.2, leading to a mean redshift for the bright and faint sample of 0.85 and 0.90, respectively. We measure the projected angular correlation function and obtain a galaxy bias averaging on scales from 1 to 10 Mpc h-1 of 1.58 ± 0.10 for the bright sample and 1.65 ± 0.12 for the faint sample. These values are representative of a galaxy population with MB - log(h) < -20.5, in agreement with what we measure by fitting galaxy templates to the photometric data.",

keywords = "Cosmology: observations, Surveys",

author = "S. Jouvel and T. Delubac and J. Comparat and H. Camacho and A. Carnero and Abdalla, {F. B.} and Kneib, {J. P.} and A. Merson and M. Lima and F. Sobreira and {da Costa}, Luiz and F. Prada and Zhu, {G. B.} and A. Benoit-Levy and {De La Macora}, A. and N. Kuropatkin and H. Lin and Abbott, {T. M.C.} and S. Allam and M. Banerji and E. Bertin and D. Brooks and D. Capozzi and Kind, {M. Carrasco} and J. Carretero and Castander, {F. J.} and Cunha, {C. E.} and S. Desai and P. Doel and Eifler, {T. F.} and J. Estrada and {Fausti Neto}, A. and B. Flaugher and P. Fosalba and J. Frieman and E. Gaztanaga and Gerdes, {D. W.} and D. Gruen and Gruendl, {R. A.} and G. Gutierrez and K. Honscheid and James, {D. J.} and K. Kuehn and O. Lahav and Li, {T. S.} and Maia, {M. A.G.} and M. March and Marshall, {J. L.} and R. Miquel and R. Ogando and Percival, {W. J.} and Plazas, {A. A.} and K. Reil and Romer, {A. K.} and A. Roodman and Rykoff, {E. S.} and M. Sako and E. Sanchez and B. Santiago and V. Scarpine and I. Sevilla-Noarbe and M. Soares-Santos and E. Suchyta and G. Tarle and J. Thaler and D. Thomas and A. Walker and Y. Zhang and J. Brownstein",

note = "Publisher Copyright: {\textcopyright} 2017 The Authors.",

year = "2017",

month = aug,

day = "11",

doi = "10.1093/mnras/stx163",

language = "English",

volume = "469",

pages = "2771--2790",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "3",

}

Jouvel, S, Delubac, T, Comparat, J, Camacho, H, Carnero, A, Abdalla, FB, Kneib, JP, Merson, A, Lima, M, Sobreira, F, da Costa, L, Prada, F, Zhu, GB, Benoit-Levy, A, De La Macora, A, Kuropatkin, N, Lin, H, Abbott, TMC, Allam, S, Banerji, M, Bertin, E, Brooks, D, Capozzi, D, Kind, MC, Carretero, J, Castander, FJ, Cunha, CE, Desai, S, Doel, P, Eifler, TF, Estrada, J, Fausti Neto, A, Flaugher, B, Fosalba, P, Frieman, J, Gaztanaga, E, Gerdes, DW, Gruen, D, Gruendl, RA, Gutierrez, G, Honscheid, K, James, DJ, Kuehn, K, Lahav, O, Li, TS, Maia, MAG, March, M, Marshall, JL, Miquel, R, Ogando, R, Percival, WJ, Plazas, AA, Reil, K, Romer, AK, Roodman, A, Rykoff, ES, Sako, M, Sanchez, E, Santiago, B, Scarpine, V, Sevilla-Noarbe, I, Soares-Santos, M, Suchyta, E, Tarle, G, Thaler, J, Thomas, D, Walker, A, Zhang, Y & Brownstein, J 2017, 'Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS', Monthly Notices of the Royal Astronomical Society, vol. 469, no. 3, pp. 2771-2790. https://doi.org/10.1093/mnras/stx163

TY - JOUR

T1 - Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS

AU - Jouvel, S.

AU - Delubac, T.

AU - Comparat, J.

AU - Camacho, H.

AU - Carnero, A.

AU - Abdalla, F. B.

AU - Kneib, J. P.

AU - Merson, A.

AU - Lima, M.

AU - Sobreira, F.

AU - da Costa, Luiz

AU - Prada, F.

AU - Zhu, G. B.

AU - Benoit-Levy, A.

AU - De La Macora, A.

AU - Kuropatkin, N.

AU - Lin, H.

AU - Abbott, T. M.C.

AU - Allam, S.

AU - Banerji, M.

AU - Bertin, E.

AU - Brooks, D.

AU - Capozzi, D.

AU - Kind, M. Carrasco

AU - Carretero, J.

AU - Castander, F. J.

AU - Cunha, C. E.

AU - Desai, S.

AU - Doel, P.

AU - Eifler, T. F.

AU - Estrada, J.

AU - Fausti Neto, A.

AU - Flaugher, B.

AU - Fosalba, P.

AU - Frieman, J.

AU - Gaztanaga, E.

AU - Gerdes, D. W.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gutierrez, G.

AU - Honscheid, K.

AU - James, D. J.

AU - Kuehn, K.

AU - Lahav, O.

AU - Li, T. S.

AU - Maia, M. A.G.

AU - March, M.

AU - Marshall, J. L.

AU - Miquel, R.

AU - Ogando, R.

AU - Percival, W. J.

AU - Plazas, A. A.

AU - Reil, K.

AU - Romer, A. K.

AU - Roodman, A.

AU - Rykoff, E. S.

AU - Sako, M.

AU - Sanchez, E.

AU - Santiago, B.

AU - Scarpine, V.

AU - Sevilla-Noarbe, I.

AU - Soares-Santos, M.

AU - Suchyta, E.

AU - Tarle, G.

AU - Thaler, J.

AU - Thomas, D.

AU - Walker, A.

AU - Zhang, Y.

AU - Brownstein, J.

PY - 2017/8/11

Y1 - 2017/8/11

N2 - We present the results of the first observations of the emission line galaxies (ELG) of the extended Baryon Oscillation Spectroscopic Survey. From the total 9000 targets, 4600 have been selected from the Dark Energy Survey (DES). In this subsample, the total success rate for redshifts between 0.6 and 1.2 is 71 and 68 per cent for a bright and a faint samples, respectively, including redshifts measured from a single strong emission line. The mean redshift is 0.80 for the bright and 0.87 for the faint sample, while the percentage of unknown redshifts is 15 and 13 per cent, respectively. In both cases, the star contamination is lower than 2 per cent. We evaluate how well the ELG redshifts are measured using the target selection photometry and validating with the spectroscopic redshifts measured by eBOSS. We explore different techniques to reduce the photometric redshift outliers fraction with a comparison between the template fitting, the neural networks and the random forest methods. Finally, we study the clustering properties of the DES SVA1 ELG samples. We select only the most secure spectroscopic redshift in the redshift range 0.6 < z < 1.2, leading to a mean redshift for the bright and faint sample of 0.85 and 0.90, respectively. We measure the projected angular correlation function and obtain a galaxy bias averaging on scales from 1 to 10 Mpc h-1 of 1.58 ± 0.10 for the bright sample and 1.65 ± 0.12 for the faint sample. These values are representative of a galaxy population with MB - log(h) < -20.5, in agreement with what we measure by fitting galaxy templates to the photometric data.

AB - We present the results of the first observations of the emission line galaxies (ELG) of the extended Baryon Oscillation Spectroscopic Survey. From the total 9000 targets, 4600 have been selected from the Dark Energy Survey (DES). In this subsample, the total success rate for redshifts between 0.6 and 1.2 is 71 and 68 per cent for a bright and a faint samples, respectively, including redshifts measured from a single strong emission line. The mean redshift is 0.80 for the bright and 0.87 for the faint sample, while the percentage of unknown redshifts is 15 and 13 per cent, respectively. In both cases, the star contamination is lower than 2 per cent. We evaluate how well the ELG redshifts are measured using the target selection photometry and validating with the spectroscopic redshifts measured by eBOSS. We explore different techniques to reduce the photometric redshift outliers fraction with a comparison between the template fitting, the neural networks and the random forest methods. Finally, we study the clustering properties of the DES SVA1 ELG samples. We select only the most secure spectroscopic redshift in the redshift range 0.6 < z < 1.2, leading to a mean redshift for the bright and faint sample of 0.85 and 0.90, respectively. We measure the projected angular correlation function and obtain a galaxy bias averaging on scales from 1 to 10 Mpc h-1 of 1.58 ± 0.10 for the bright sample and 1.65 ± 0.12 for the faint sample. These values are representative of a galaxy population with MB - log(h) < -20.5, in agreement with what we measure by fitting galaxy templates to the photometric data.

KW - Cosmology: observations

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=85037087824&partnerID=8YFLogxK

U2 - 10.1093/mnras/stx163

DO - 10.1093/mnras/stx163

M3 - Article

AN - SCOPUS:85037087824

SN - 0035-8711

VL - 469

SP - 2771

EP - 2790

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Cite this