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Assessing the photometric redshift precision of the S-PLUS survey: the Stripe-82 as a test-case.
- Source :
- Monthly Notices of the Royal Astronomical Society; Dec2020, Vol. 499 Issue 3, p3884-3908, 25p
- Publication Year :
- 2020
-
Abstract
- 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 deg<superscript>2</superscript> 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 σ<subscript> z </subscript> <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 σ<subscript> z </subscript> <1.0 per cent, <2.0 per cent, and <2.5 per cent after observing 8000 deg<superscript>2</superscript>. 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00358711
- Volume :
- 499
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Publication Type :
- Academic Journal
- Accession number :
- 147178732
- Full Text :
- https://doi.org/10.1093/mnras/staa1586