DOE OSTI · 2432453
Enhancing weak lensing redshift distribution characterization by optimizing the Dark Energy Survey Self-Organizing Map Photo-z method
Abstract
Characterization of the redshift distribution of ensembles of galaxies is pivotal for large scale structure cosmological studies. In this work, we focus on improving the Self-Organizing Map (SOM) methodology for photometric redshift estimation (SOMPZ), specifically in anticipation of the Dark Energy Survey Year 6 (DES Y6) data. This data set, featuring deeper and fainter galaxies than DES Year 3 (DES Y3), demands adapted techniques to ensure accurate recovery of the underlying redshift distribution. We investigate three strategies for enhancing the existing SOM-based approach used in DES Y3: 1) Replacing the Y3 SOM algorithm with one tailored for redshift estimation challenges; 2) Incorporating $\textit{g}$-band flux information to refine redshift estimates (i.e. using $\textit{griz}$ fluxes as opposed to only $\textit{riz}$); 3) Augmenting redshift data for galaxies where available. These methods are applied to DES Y3 data, and results are compared to the Y3 fiducial ones. Our analysis indicates significant improvements with the first two strategies, notably reducing the overlap between redshift bins. By combining strategies 1 and 2, we have successfully managed to reduce redshift bin overlap in DES Y3 by up to 66$\%$. Conversely, the third strategy, involving the addition of redshift data for selected galaxies as an additional feature in the method, yields inferior results and is abandoned. Our findings contribute to the advancement of weak lensing redshift characterization and lay the groundwork for better redshift characterization in DES Year 6 and future stage IV surveys, like the Rubin Observatory.
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Campos, A. [Carnegie Mellon U.] (ORCID:0000000251240771), Yin, B. [Duke U.] (ORCID:0009000656049980), Dodelson, S. [Carnegie Mellon U.] (ORCID:0000000284463859), Amon, A. [Cambridge U., Inst. of Astron.], Alarcon, A. [Argonne; Barcelona, IEEC], Sánchez, C. [UPenn, Philadelphia], Bernstein, G. M. [UPenn, Philadelphia], Giannini, G. [Chicago U., KICP; Barcelona, IFAE] (ORCID:0000000237301750), Myles, J. [Princeton U., Astrophys. Sci. Dept.], Samuroff, S. [Northeastern U.], Alves, O. [U. Michigan, Ann Arbor], Andrade-Oliveira, F. [U. Michigan, Ann Arbor], Bechtol, K. [Wisconsin U., Madison], Becker, M. R. [Argonne], Blazek, J. [Northeastern U.], Camacho, H. [LIneA, Rio de Janeiro; Sao Paulo, IFT; Brookhaven], Carnero Rosell, A. [LIneA, Rio de Janeiro; IAC, La Laguna; Laguna U., Tenerife], Carrasco Kind, M. [Illinois U., Urbana, Astron. Dept.; Illinois U., Urbana (main)], Cawthon, R. [William-Mary Coll.], Chang, C. [Chicago U., Astron. Astrophys. Ctr.; Chicago U., KICP] (ORCID:0000000278870896), Chen, R. [Duke U.], Choi, A. [NASA, Goddard], Cordero, J. [Jodrell Bank], Davis, C. [KIPAC, Menlo Park], DeRose, J. [LBL, Berkeley], Diehl, H. T. [Fermilab] (ORCID:0000000283577467), Doux, C. [UPenn, Philadelphia; LPSC, Grenoble], Drlica-Wagner, A. [Chicago U., KICP; Chicago U., Astron. Astrophys. Ctr.; Fermilab] (ORCID:000000018251933X), Eckert, K. [UPenn, Philadelphia], Eifler, T. F. [Caltech, JPL; Arizona U., Astron. Dept. - Steward Observ.], Elvin-Poole, J. [Waterloo U.], Everett, S. [Caltech, JPL], Fang, X. [Arizona U., Astron. Dept. - Steward Observ.; UC, Berkeley, Astron. Dept.] (ORCID:0000000250549566), Ferté, A. [SLAC], Friedrich, O. [Cambridge U., Inst. of Astron.], Gatti, M. [UPenn, Philadelphia], Gruen, D. [Munich U.], Gruendl, R. A. [Illinois U., Urbana, Astron. Dept.; Illinois U., Urbana (main)], Harrison, I. [Cardiff U.], Hartley, W. G. [U. Geneva (main)], Herner, K. [Fermilab], Huang, H. [Arizona U., Astron. Dept. - Steward Observ.; Arizona U.], Huff, E. M. [Caltech, JPL], Jarvis, M. [UPenn, Philadelphia], Krause, E. [Arizona U., Astron. Dept. - Steward Observ.], Kuropatkin, N. [Fermilab], Leget, P.-F. [KIPAC, Menlo Park], MacCrann, N. [Cambridge U., DAMTP], McCullough, J. [KIPAC, Menlo Park] (ORCID:0000000244753456), Navarro-Alsina, A. [Campinas State U.], Pandey, S. [UPenn, Philadelphia], Prat, J. [Nordita; Chicago U., Astron. Astrophys. Ctr.], Raveri, M. [MIT, Cambridge, Dept. Phys.; INFN, Genoa], Rollins, R. P. [Jodrell Bank], Roodman, A. [KIPAC, Menlo Park; SLAC], Rosenfeld, R. [Sao Paulo, IFT; LIneA, Rio de Janeiro], Ross, A. J. [Ohio State U., CCAPP], Rykoff, E. S. [SLAC; KIPAC, Menlo Park], Sanchez, J. [Baltimore, Space Telescope Sci.], Secco, L. F. [Chicago U., KICP], Sevilla-Noarbe, I. [Madrid, CIEMAT], Sheldon, E. [Brookhaven], Shin, T. [SUNY, Stony Brook], Troxel, M. A. [Duke U.], Tutusaus, I. [IRAP, Toulouse], Varga, T. N. [ORIGINS, Garching; Garching, Max Planck Inst., MPE; Munich U.], Wechsler, R. H. [KIPAC, Menlo Park; Stanford U.; SLAC], Yanny, B. [Fermilab] (ORCID:0000000295412678), Zhang, Y. [Cerro-Tololo InterAmerican Obs.], Zuntz, J. [Edinburgh U., Inst. Astron.], Aguena, M. [LIneA, Rio de Janeiro], Annis, J. [Fermilab], Bacon, D. [Portsmouth U., ICG], Bocquet, S. [Munich U.], Brooks, D. [University Coll. London], Burke, D. L. [KIPAC, Menlo Park; SLAC], Carretero, J. [Barcelona, IFAE], Castander, F. J. [Barcelona, IEEC], Costanzi, M. [IFPU, Trieste; Trieste Observ.], da Costa, L. N. [LIneA, Rio de Janeiro], De Vicente, J. [Madrid, CIEMAT], Doel, P. [University Coll. London], Ferrero, I. [Inst. Theor. Astrophys., Oslo], Flaugher, B. [Fermilab] (ORCID:0000000223675049), Frieman, J. [Chicago U., KICP; Fermilab] (ORCID:0000000340793263), García-Bellido, J. [Madrid, IFT], Gaztanaga, E. [Barcelona, IEEC; Portsmouth U., ICG], Gutierrez, G. [Fermilab] (ORCID:0000000308250517), Hinton, S. R. [Queensland U.], Hollowood, D. L. [UC, Santa Cruz], Honscheid, K. [Ohio State U., CCAPP; Ohio State U.], James, D. J. [Harvard-Smithsonian Ctr. Astrophys.], Kuehn, K. [Australia, CSIRO, North Ryde; Lowell Observ.], Lima, M. [LIneA, Rio de Janeiro; Sao Paulo U., Sao Carlos], Lin, H. [Fermilab], Marshall, J. L. [Texas A-M], Mena-Fernández, J. [LPSC, Grenoble], Menanteau, F. [Illinois U., Urbana, Astron. Dept.; Illinois U., Urbana (main)], Miquel, R. [Barcelona, IFAE; ICREA, Barcelona; Barcelona, Autonoma U.], Ogando, R. L.C. [Rio de Janeiro Observ.]. 2026-07-27. Enhancing weak lensing redshift distribution characterization by optimizing the Dark Energy Survey Self-Organizing Map Photo-z method. https://doi.org/10.33232/001c.165871
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