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Using Multivariate ...
Using Multivariate Imputation by Chained Equations to Predict Redshifts of Active Galactic Nuclei
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- Gibson, Spencer James (author)
- Carnegie Mellon University
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- Narendra, Aditya (author)
- Jagiellonian University
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- Dainotti, Maria Giovanna (author)
- Space Science Institute,National Astronomical Observatory of Japan
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- Bogdan, Malgorzata (author)
- Lund University,Lunds universitet,Statistiska institutionen,Ekonomihögskolan,Department of Statistics,Lund University School of Economics and Management, LUSEM,Wroclaw University
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- Pollo, Agnieszka (author)
- Jagiellonian University
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Poliszczuk, Artem (author)
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- Rinaldi, Enrico (author)
- RIKEN SPring-8 center,University of Michigan
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- Liodakis, Ioannis (author)
- University of Turku
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(creator_code:org_t)
- 2022-03-04
- 2022
- English.
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In: Frontiers in Astronomy and Space Sciences. - : Frontiers Media SA. - 2296-987X. ; 9
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Abstract
Subject headings
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- Redshift measurement of active galactic nuclei (AGNs) remains a time-consuming and challenging task, as it requires follow up spectroscopic observations and detailed analysis. Hence, there exists an urgent requirement for alternative redshift estimation techniques. The use of machine learning (ML) for this purpose has been growing over the last few years, primarily due to the availability of large-scale galactic surveys. However, due to observational errors, a significant fraction of these data sets often have missing entries, rendering that fraction unusable for ML regression applications. In this study, we demonstrate the performance of an imputation technique called Multivariate Imputation by Chained Equations (MICE), which rectifies the issue of missing data entries by imputing them using the available information in the catalog. We use the Fermi-LAT Fourth Data Release Catalog (4LAC) and impute 24% of the catalog. Subsequently, we follow the methodology described in Dainotti et al. (ApJ, 2021, 920, 118) and create an ML model for estimating the redshift of 4LAC AGNs. We present results which highlight positive impact of MICE imputation technique on the machine learning models performance and obtained redshift estimation accuracy.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- AGNs
- BLLs
- FERMI 4LAC
- FSRQs
- imputation
- machine learning regressors
- MICE
- redshift
Publication and Content Type
- art (subject category)
- ref (subject category)
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