2014MNRAS.445.1482S

Query : 2014MNRAS.445.1482S

2014MNRAS.445.1482S - Mon. Not. R. Astron. Soc., 445, 1482-1506 (2014/December-1)

Photometric redshift analysis in the Dark Energy Survey Science Verification data.

SANCHEZ C., CARRASCO KIND M., LIN H., MIQUEL R., ABDALLA F.B., AMARA A., BANERJI M., BONNETT C., BRUNNER R., CAPOZZI D., CARNERO A., CASTANDER F.J., DA COSTA L.A.N., CUNHA C., FAUSTI A., GERDES D., GREISEL N., GSCHWEND J., HARTLEY W., JOUVEL S., LAHAV O., LIMA M., MAIA M.A.G., MARTI P., OGANDO R.L.C., OSTROVSKI F., PELLEGRINI P., RAU M.M., SADEH I., SEITZ S., SEVILLA-NOARBE I., SYPNIEWSKI A., DE VICENTE J., ABBOT T., ALLAM S.S., ATLEE D., BERNSTEIN G., BERNSTEIN J.P., BUCKLEY-GEER E., BURKE D., CHILDRESS M.J., DAVIS T., DEPOY D.L., DEY A., DESAI S., DIEHL H.T., DOEL P., ESTRADA J., EVRARD A., FERNANDEZ E., FINLEY D., FLAUGHER B., FRIEMAN J., GAZTANAGA E., GLAZEBROOK K., HONSCHEID K., KIM A., KUEHN K., KUROPATKIN N., LIDMAN C., MAKLER M., MARSHALL J.L., NICHOL R.C., ROODMAN A., SANCHEZ E., SANTIAGO B.X., SAKO M., SCALZO R., SMITH R.C., SWANSON M.E.C., TARLE G., THOMAS D., TUCKER D.L., UDDIN S.A., VALDES F., WALKER A., YUAN F. and ZUNTZ J.

Abstract (from CDS):

We present results from a study of the photometric redshift performance of the Dark Energy Survey (DES), using the early data from a Science Verification period of observations in late 2012 and early 2013 that provided science-quality images for almost 200 sq. deg. at the nominal depth of the survey. We assess the photometric redshift (photo-z) performance using about 15 000 galaxies with spectroscopic redshifts available from other surveys. These galaxies are used, in different configurations, as a calibration sample, and photo-z's are obtained and studied using most of the existing photo-z codes. A weighting method in a multidimensional colour-magnitude space is applied to the spectroscopic sample in order to evaluate the photo-z performance with sets that mimic the full DES photometric sample, which is on average significantly deeper than the calibration sample due to the limited depth of spectroscopic surveys. Empirical photo-z methods using, for instance, artificial neural networks or random forests, yield the best performance in the tests, achieving core photo-z resolutions σ68 ∼ 0.08. Moreover, the results from most of the codes, including template-fitting methods, comfortably meet the DES requirements on photo-z performance, therefore, providing an excellent precedent for future DES data sets.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): Astronomical data bases: surveys - galaxies: distances and redshifts - galaxies: statistics - large-scale structure of Universe

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2282 1
2 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 3639 0
3 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1

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