The Quasar Catalogue for S-PLUS DR4 (QuCatS) and the estimation of photometric redshifts

Data de publicação
Monthly Notices of the Royal Astronomical Society
Citações (Scopus)
Nakazono L.
Valenca R.R.
Soares G.
Izbicki R.
Ivezic Z.
Lima E.V.R.
Hirata N.S.T.
Sodre L.
Overzier R.
Almeida-Fernandes F.
Schwarz G.B.O.
Schoenell W.
Kanaan A.
Ribeiro T.
de Oliveira C.M.
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© 2024 Oxford University Press. All rights reserved.The advent of massive broad-band photometric surveys enabled photometric redshift estimates for unprecedented numbers of galaxies and quasars. These estimates can be improved using better algorithms or by obtaining complementary data such as narrow-band photometry, and broad-band photometry over an extended wavelength range. We investigate the impact of both approaches on photometric redshifts for quasars using data from Southern Photometric Local Universe Survey (S-PLUS) DR4, Galaxy Evolution Explorer (GALEX) DR6/7, and the unWISE catalog for the Wide-field Infrared Survey Explorer (WISE) in three machine learning methods: Random Forest, Flexible Conditional Density Estimation (FlexCoDE), and Bayesian Mixture Density Network (BMDN). Including narrow-band photometry improves the root-mean-square error by 11 per cent in comparison to a model trained with only broad-band photometry. Narrow-band information only provided an improvement of 3.8 per cent when GALEX and WISE colours were included. Thus, narrow bands play a more important role for objects that do not have GALEX or WISE counterparts, which respectively makes 92 per cent and 25 per cent of S-PLUS data considered here. Nevertheless, the inclusion of narrow-band information provided better estimates of the probability density functions obtained with FlexCoDE and BMDN. We publicly release a value-added catalogue of photometrically selected quasars with the photo-z predictions from all methods studied here. The catalogue provided with this work covers the S-PLUS DR4 area (∼3000 square degrees), containing 645 980, 244 912, 144 991 sources with the probability of being a quasar higher than, 80 per cent, 90 per cent, 95 per cent up to r < 21.3 and good photometry quality in the detection image. More quasar candidates can be retrieved from the S-PLUS data base by considering less restrictive selection criteria.
Assuntos Scopus
Broad bands , Catalog , Conditional density , Galaxy evolution , Methods:statistical , Narrow bands , Photometrics , Quasars:general , Red shift , Wide-field
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