Clustering-based redshift estimation: application to VIPERS/CFHTLS
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Clustering-based redshift estimation applied to galaxy surveys; an astronomy method used to answer an astronomy question.
The work tests a redshift-estimation technique for galaxy surveys rather than studying research practice.
Astronomy method for clustering-based redshift estimation; domain astrophysics technique.
Résumé
We explore the accuracy of the clustering-based redshift estimation proposed by Ménard et al. when applied to VIMOS Public Extragalactic Redshift Survey (VIPERS) and Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) real data. This method enables us to reconstruct redshift distributions from measurement of the angular clustering of objects using a set of secure spectroscopic redshifts. We use state-of-the-art spectroscopic measurements with iAB < 22.5 from the VIPERS as reference population to infer the redshift distribution of galaxies from the CFHTLS T0007 release. VIPERS provides a nearly representative sample to a flux limit of iAB < 22.5 at a redshift of >0.5 which allows us to test the accuracy of the clustering-based redshift distributions. We show that this method enables us to reproduce the true mean colour–redshift relation when both populations have the same magnitude limit. We also show that this technique allows the inference of redshift distributions for a population fainter than the reference and we give an estimate of the colour–redshift mapping in this case. This last point is of great interest for future large-redshift surveys which require a complete faint spectroscopic sample.
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La notice
- Revue
- Monthly Notices of the Royal Astronomical Society
- Thématique
- Galaxies: Formation, Evolution, Phenomena
- Domaine
- Physics and Astronomy
- Établissements canadiens
- —
- Organismes subventionnaires
- Institut national des sciences de l'UniversInstitut Universitaire de FranceCentre National de la Recherche ScientifiqueEuropean Southern ObservatoryNarodowym Centrum NaukiScience and Technology Facilities CouncilMinistero dell’Istruzione, dell’Università e della RicercaNational Aeronautics and Space AdministrationEuropean CommissionCalifornia Institute of TechnologyAgence Nationale de la RechercheCentre National d’Etudes Spatiales
- Mots-clés
- RedshiftPhysicsRedshift surveyAstrophysicsGalaxyPhotometric redshiftCluster analysisPopulationAstronomyArtificial intelligenceComputer science
- Résumé présent dans OpenAlex
- oui