TY - JOUR
T1 - Dark Energy Survey Year 1 Results: calibration of redMaGiC redshift distributions in DES and SDSS from cross-correlations
AU - Dark Energy Survey Collaboration
AU - Cawthon, R.
AU - Davis, Clare
AU - Gatti, M.
AU - Vielzeuf, P.
AU - Elvin-Poole, Jack
AU - Rozo, Eduardo
AU - Frieman, Joshua A.
AU - Rykoff, Eli S.
AU - Alarcon, A.
AU - Bernstein, Gary M.
AU - Bonnett, Christopher
AU - Rosell, Aurelio Carnero
AU - Castander, Francisco Javier
AU - Chang, C.
AU - Costa, L. N. da
AU - Vicente, Juan de
AU - De Rose, J
AU - Drlica-Wagner, Alex
AU - Gaztanaga, Enrique
AU - Giannantonio, T.
AU - Gruen, Daniel
AU - Gschwend, Julia
AU - Hartley, William G.
AU - Hoyle, B.
AU - Lin, H.
AU - Maia, Marcio Antonio Geimba
AU - Miquel, Ramon
AU - Ogando, Ricardo L. C.
AU - Rau, M. M.
AU - Roodman, Aaron
AU - Ross, A. J.
AU - Bertin, Emmanuel
AU - Brooks, David
AU - Burke, David L.
AU - Carrasco Kind, Matias
AU - Carretero, Jorge
AU - Cunha, Carlos E.
AU - D'Andrea, C. B.
AU - DePoy, D. L.
AU - Desai, S.
AU - Diehl, H. Thomas
AU - Doel, Peter
AU - Eifler, Tim F.
AU - Evrard, A. E.
AU - Flaugher, B.
AU - Fosalba, Pablo
AU - García-Bellido, Juan
AU - Gerdes, David W.
AU - Gruendl, Robert A.
AU - Gutierrez, G.
AU - Hollowood, D. L.
AU - Honscheid, Klaus
AU - James, Derek
AU - Jeltema, Tesla E.
AU - Krause, Elisabeth
AU - Kuehn, Kyler
AU - Kuhlmann, S.
AU - Kuropatkin, Nikolay
AU - Lahav, Ofer
AU - Lima, M.
AU - Marshall, J. L.
AU - Martini, Paul
AU - Menanteau, Felipe
AU - Miller, Christopher J.
AU - Plazas, Andres A.
AU - Sanchez, Eusebio
AU - Scarpine, Vic
AU - Schindler, Rafe H.
AU - Schubnell, Michael
AU - Smith, Malcolm
AU - Smith, Robert Chris
AU - Soares-Santos, Marcelle
AU - Sobreira, Flavia
AU - Suchyta, Eric
AU - Swanson, Molly E. C.
AU - Tarle, Gregory
AU - Thomas, Daniel
AU - Tucker, Douglas L.
AU - Walker, Alistair R.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - We present calibrations of the redshift distributions of redMaGiC galaxies in the Dark Energy Survey Year 1 (DES Y1) and Sloan Digital Sky Survey (SDSS) DR8 data. These results determine the priors of the redshift distribution of redMaGiC galaxies, which were used for galaxy clustering measurements and as lenses for galaxy–galaxy lensing measurements in DES Y1 cosmological analyses. We empirically determine the bias in redMaGiC photometric redshift estimates using angular cross-correlations with Baryon Oscillation Spectroscopic Survey (BOSS) galaxies. For DES, we calibrate a single-parameter redshift bias in three photometric redshift bins: z ∈ [0.15, 0.3], [0.3,0.45], and [0.45,0.6]. Our best-fit results in each bin give photometric redshift biases of |Δz| < 0.01. To further test the redMaGiC algorithm, we apply our calibration procedure to SDSS redMaGiC galaxies, where the statistical precision of the cross-correlation measurement is much higher due to a greater overlap with BOSS galaxies. For SDSS, we also find best-fit results of |Δz| < 0.01. We compare our results to other analyses of redMaGiC photometric redshifts.
AB - We present calibrations of the redshift distributions of redMaGiC galaxies in the Dark Energy Survey Year 1 (DES Y1) and Sloan Digital Sky Survey (SDSS) DR8 data. These results determine the priors of the redshift distribution of redMaGiC galaxies, which were used for galaxy clustering measurements and as lenses for galaxy–galaxy lensing measurements in DES Y1 cosmological analyses. We empirically determine the bias in redMaGiC photometric redshift estimates using angular cross-correlations with Baryon Oscillation Spectroscopic Survey (BOSS) galaxies. For DES, we calibrate a single-parameter redshift bias in three photometric redshift bins: z ∈ [0.15, 0.3], [0.3,0.45], and [0.45,0.6]. Our best-fit results in each bin give photometric redshift biases of |Δz| < 0.01. To further test the redMaGiC algorithm, we apply our calibration procedure to SDSS redMaGiC galaxies, where the statistical precision of the cross-correlation measurement is much higher due to a greater overlap with BOSS galaxies. For SDSS, we also find best-fit results of |Δz| < 0.01. We compare our results to other analyses of redMaGiC photometric redshifts.
KW - RCUK
KW - STFC
KW - AST-1536171
KW - AST-1138766
UR - http://discovery.ucl.ac.uk/10060856/
U2 - 10.1093/mnras/sty2424
DO - 10.1093/mnras/sty2424
M3 - Article
SN - 1745-3925
VL - 481
SP - 2427
EP - 2443
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 2
M1 - sty2424
ER -