Examinando por Autor "Lima E.V.R."

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    Assessing the photometric redshift precision of the S-PLUS survey: The Stripe-82 as a test-case
    (Oxford University Press, 2020-12) Molino A.; Costa-Duarte M.V.; Sampedro L.; Herpich F.R.; Sodré L.; Jr. Mendes de Oliveira C.; Schoenell W.; Barbosa C.E.; Queiroz C.; Lima E.V.R.; Azanha L.; Muñoz-Elgueta N.; Ribeiro T.; Kanaan A.; Hernandez-Jimenez J.A.; Cortesi A.; Akras S.; Lopes de Oliveira R.; Torres-Flores S.; Lima-Dias C.; Nilo Castellon J.L.; Damke G.; Alvarez-Candal A.; Jiménez-Teja Y.; Coelho P.; Pereira E.; Montero-Dorta A.D.; Benítez N.; Gonçalves T.S.; Santana-Silva L.; Werner S.V.; Almeida L.A.; Lopes P.A.A.; Chies-Santos A.L.; Telles E.; Thom de Souza R.C.; Gonçalves D.R.; de Souza R.S.; Makler M.; Buzzo M.L.; Placco V.M.; Nakazono L.M.I.; Saito R.K.; Overzier R.A.; Abramo L.R.
    In this paper we present a thorough discussion about the photometric redshift (photo-z) performance of the Southern Photometric Local Universe Survey (S-PLUS). This survey combines a seven narrow +5 broad passband filter system, with a typical photometric-depth of r ∼ 21 AB. For this exercise, we utilize the Data Release 1 (DR1), corresponding to 336 deg2 from the Stripe-82 region. We rely on the BPZ2 code to compute our estimates, using a new library of SED models, which includes additional templates for quiescent galaxies. When compared to a spectroscopic redshift control sample of ∼100 k galaxies, we find a precision of σz <0.8 per cent, <2.0 per cent, or <3.0 per cent for galaxies with magnitudes r < 17, <19, and <21, respectively. A precision of 0.6 per cent is attained for galaxies with the highest Odds values. These estimates have a negligible bias and a fraction of catastrophic outliers inferior to 1 per cent. We identify a redshift window (i.e. 0.26 < z < 0.32) where our estimates double their precision, due to the simultaneous detection of two emission lines in two distinct narrow bands; representing a window opportunity to conduct statistical studies such as luminosity functions. We forecast a total of ∼2 M, ∼16 M and ∼32 M galaxies in the S-PLUS survey with a photo-z precision of σz <1.0 per cent, <2.0 per cent, and <2.5 per cent after observing 8000 deg2. We also derive redshift probability density functions, proving their reliability encoding redshift uncertainties and their potential recovering the n(z) of galaxies at z < 0.4, with an unprecedented precision for a photometric survey in the Southern hemisphere. © 2020 The Author(s)