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  Dark Energy Survey Year 3 results: redshift calibration of the weak lensing source galaxies

Myles, J., Alarcon, A., Amon, A., Sanchez, C., Everett, S., DeRose, J., et al. (2021). Dark Energy Survey Year 3 results: redshift calibration of the weak lensing source galaxies. Monthly Notices of the Royal Astronomical Society, 505(3), 4249-4277. doi:10.1093/mnras/stab1515.

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Myles, J., Author
Alarcon, A., Author
Amon, A., Author
Sanchez, C., Author
Everett, S., Author
DeRose, J., Author
McCullough, J., Author
Gruen, D., Author
Bernstein, G. M., Author
Troxel, M. A., Author
Dodelson, S., Author
Campos, A., Author
MacCrann, N., Author
Yin, B., Author
Raveri, M., Author
Amara, A., Author
Becker, M. R., Author
Choi, A., Author
Cordero, J., Author
Eckert, K., Author
Gatti, M., AuthorGiannini, G., AuthorGschwend, J., AuthorGruendl, R. A., AuthorHarrison, I., AuthorHartley, W. G., AuthorHuff, E. M., AuthorKuropatkin, N., AuthorLin, H., AuthorMasters, D., AuthorMiquel, R., AuthorPrat, J., AuthorRoodman, A., AuthorRykoff, E. S., AuthorSevilla-Noarbe, I., AuthorSheldon, E., AuthorWechsler, R. H., AuthorYanny, B., AuthorAbbott, T. M. C., AuthorAguena, M., AuthorAllam, S., AuthorAnnis, J., AuthorBacon, D., AuthorBertin, E., AuthorBhargava, S., AuthorBridle, S. L., AuthorBrooks, D., AuthorBurke, D. L., AuthorRosell, A. Carnero, AuthorKind, M. Carrasco, AuthorCarretero, J., AuthorCastander, F. J., AuthorConselice, C., AuthorCostanzi, M., AuthorCrocce, M., Authorda Costa, L. N., AuthorPereira, M. E. S., AuthorDesai, S., AuthorDiehl, H. T., AuthorEifler, T. F., AuthorElvin-Poole, J., AuthorEvrard, A. E., AuthorFerrero, I., AuthorFerte, A., AuthorFlaugher, B., AuthorFosalba, P., AuthorFrieman, J., AuthorGarcıa-Bellido, J., AuthorGaztanaga, E., AuthorGiannantonio, T., AuthorHinton, S. R., AuthorHollowood, D. L., AuthorHonscheid, K., AuthorHoyle, B.1, Author              Huterer, D., AuthorJames, D. J., AuthorKrause, E., AuthorKuehn, K., AuthorLahav, O., AuthorLima, M., AuthorMaia, M. A. G., AuthorMarshall, J. L., AuthorMartini, P., AuthorMelchior, P., AuthorMenanteau, F., AuthorMohr, J. J.1, Author              Morgan, R., AuthorMuir, J., AuthorOgando, R. L. C., AuthorPalmese, A., AuthorPaz-Chinchon, F., AuthorPlazas, A. A., AuthorRodriguez-Monroy, M., AuthorSamuroff, S., AuthorSanchez, E., AuthorScarpine, V., AuthorSecco, L. F., AuthorSerrano, S., AuthorSmith, M., AuthorSoares-Santos, M., AuthorSuchyta, E., AuthorSwanson, M. E. C., AuthorTarle, G., AuthorThomas, D., AuthorTo, C., AuthorVarga, T. N.1, Author              Weller, J.1, Author              Wester, W., Author more..
Affiliations:
1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: Determining the distribution of redshifts of galaxies observed by wide-field photometric experiments like the Dark Energy Survey (DES) is an essential component to mapping the matter density field with gravitational lensing. In this work we describe the methods used to assign individual weak lensing source galaxies from the DES Year 3 Weak Lensing Source Catalogue to four tomographic bins and to estimate the redshift distributions in these bins. As the first application of these methods to data, we validate that the assumptions made apply to the DES Y3 weak lensing source galaxies and develop a full treatment of systematic uncertainties. Our method consists of combining information from three independent likelihood functions: self-organizing map p(z) (sompz), a method for constraining redshifts from galaxy photometry; clustering redshifts (WZ), constraints on redshifts from cross-correlations of galaxy density functions; and shear ratios (SRs), which provide constraints on redshifts from the ratios of the galaxy-shear correlation functions at small scales. Finally, we describe how these independent probes are combined to yield an ensemble of redshift distributions encapsulating our full uncertainty. We calibrate redshifts with combined effective uncertainties of σ〈z〉 ∼ 0.01 on the mean redshift in each tomographic bin.

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Language(s): eng - English
 Dates: 2021-05-27
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab1515
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Abbreviation : Mon. Not. Roy. Astron. Soc.
Source Genre: Journal
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Pages: - Volume / Issue: 505 (3) Sequence Number: - Start / End Page: 4249 - 4277 Identifier: ISSN: 0035-8711
ISSN: 1365-8711