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

Abstract

We present the results of the first test plates of the extended Baryon Oscillation Spectroscopic Survey. This paper focuses on the emission line galaxies (ELG) population targetted from the Dark Energy Survey (DES) photometry. We analyse the success rate, efficiency, redshift distribution, and clustering properties of the targets. From the 9000 spectroscopic redshifts targetted, 4600 have been selected from the DES photometry. The total success rate for redshifts between 0.6 and 1.2 is 71\% and 68\% respectively for a bright and faint, on average more distant, samples including redshifts measured from a single strong emission line. We find a mean redshift of 0.8 and 0.87, with 15 and 13\% of unknown redshifts respectively for the bright and faint samples. In the redshift range 0.6<1.2, for the most secure spectroscopic redshifts, the mean redshift for the bright and faint sample is 0.85 and 0.9 respectively. Star contamination is lower than 2\%. We measure a galaxy bias averaged on scales of 1 and 10~Mpc/h of 1.72 \pm 0.1 for the bright sample and of 1.78 \pm 0.12 for the faint sample. The error on the galaxy bias have been obtained propagating the errors in the correlation function to the fitted parameters. Thismore » redshift evolution for the galaxy bias is in agreement with theoretical expectations for a galaxy population with MB-5\log h < -21.0. We note that biasing is derived from the galaxy clustering relative to a model for the mass fluctuations. We investigate the quality of the DES photometric redshifts and find that the outlier fraction can be reduced using a comparison between template fitting and neural network, or using a random forest algorithm.« less

Authors:

Jouvel, S.; Delubac, T.; Comparat, J.; Camacho, H.; Carnero, A.; Abdalla, F. B.; Kneib, J. -P.; Merson, A.; Lima, M.; Sobreira, F.; da Costa, Luiz; Prada, F.; Zhu, G. B.; Benoit-Levy, A.; Macora, A. De La; Kuropatkin, N.; Lin, H.; Abbott, T. M. C.; Allam, S.; Banerji, M. more »; Bertin, E.; Brooks, D.; Capozzi, D.; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; Cunha, C. E.; Desai, S.; Doel, P.; Eifler, T. F.; Estrada, J.; Neto, A. Fausti; Flaugher, B.; Fosalba, P.; Frieman, J.; Gaztanaga, E.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gutierrez, G.; Honscheid, K.; James, D. J.; Kuehn, K.; Lahav, O.; Li, T. S.; Maia, M. A. G.; March, M.; Marshall, J. L.; Miquel, R.; Ogando, R.; Percival, W. J.; Plazas, A. A.; Reil, K.; Romer, A. K.; Roodman, A.; Rykoff, E. S.; 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. « less

Publication Date:

Fri Mar 24 00:00:00 EDT 2017

Research Org.:

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Org.:

National Science Foundation (NSF); USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Org.:

DES Collaboration; DES; BOSS

OSTI Identifier:

1390286

Alternate Identifier(s):

OSTI ID: 1253006

Report Number(s):

FERMILAB-PUB-15-451-AE; arXiv:1509.07121
Journal ID: ISSN 0035-8711; TRN: US1702480

Grant/Contract Number:  

AC02-76SF00515; AST1138766; AYA201239559; ESP2013- 48274; FPA2013-47986; AC02-07CH11359

Resource Type:

Accepted Manuscript

Journal Name:

Monthly Notices of the Royal Astronomical Society

Additional Journal Information:

Journal Volume: 469; Journal Issue: 3; Journal ID: ISSN 0035-8711

Publisher:

Royal Astronomical Society

Country of Publication:

United States

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS; surveys; cosmology; observations