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Identifying and Repairing Catastrophic Errors in Galaxy Properties Using Dimensionality Reduction

Hovis-Afflerbach, Beryl and Steinhardt, Charles L. and Masters, Daniel and Salvato, Mara (2021) Identifying and Repairing Catastrophic Errors in Galaxy Properties Using Dimensionality Reduction. Astrophysical Journal, 908 (2). Art. No. 148. ISSN 1538-4357. https://resolver.caltech.edu/CaltechAUTHORS:20210217-151708469

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Abstract

Our understanding of galaxy evolution is derived from large surveys designed to maximize efficiency by only observing the minimum amount needed to infer properties for a typical galaxy. However, for a few percent of galaxies in every survey, these observations are insufficient and derived properties can be catastrophically wrong. Further, it is currently difficult or impossible to determine which objects have failed, so that these contaminate every study of galaxy properties. We develop a novel method to identify these objects by combining the astronomical codes that infer galaxy properties with the dimensionality reduction algorithm t-SNE, which groups similar objects to determine which inferred properties are out of place. This method provides an improvement for the COSMOS catalog, which already uses existing techniques for catastrophic error removal, and therefore should improve the quality of large catalogs and any studies that are sensitive to large redshift errors.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/abd329DOIArticle
https://arxiv.org/abs/2012.07855arXivDiscussion Paper
ORCID:
AuthorORCID
Hovis-Afflerbach, Beryl0000-0002-9967-2725
Steinhardt, Charles L.0000-0003-3780-6801
Masters, Daniel0000-0001-5382-6138
Salvato, Mara0000-0001-7116-9303
Additional Information:© 2021 The American Astronomical Society. Received 2020 November 9; revised 2020 December 10; accepted 2020 December 11; published 2021 February 19. The authors would like to thank Gabe Brammer, Iary Davidzon, Christian Kragh Jespersen, and John Weaver for useful discussions. B.H. thanks Kathryn McEachern for her generous contribution to the SURF program and to this research in memory of David L. Glackin. C.S. is supported by ERC grant 648179 "ConTExt". The Cosmic Dawn Center (DAWN) is funded by the Danish National Research Foundation under grant No. 140. Based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory under ESO program ID 179.A-2005 and on data products produced by TERAPIX and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium.
Group:Infrared Processing and Analysis Center (IPAC), COSMOS
Funders:
Funding AgencyGrant Number
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
European Research Council (ERC)648179
Danish National Research Foundation140
Subject Keywords:Astronomy data analysis ; Redshift surveys ; High-redshift galaxies ; Photometry ; Dimensionality reduction ; Galaxy properties
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Astronomy data analysis (1858); Redshift surveys (1378); High-redshift galaxies (734); Photometry (1234); Dimensionality reduction (1943); Galaxy properties (615)
Record Number:CaltechAUTHORS:20210217-151708469
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210217-151708469
Official Citation:Beryl Hovis-Afflerbach et al 2021 ApJ 908 148
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108097
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Feb 2021 17:25
Last Modified:22 Feb 2021 20:10

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