Estimating Galaxy Parameters with Self-Organizing Maps and the Effect of Missing Data
Abstract
The current and upcoming large data volume galaxy surveys require the use of machine learning techniques to maximize their scientific return. This study explores the use of Self-Organizing Maps (SOMs) to estimate galaxy parameters with a focus on handling cases of missing data and providing realistic probability distribution functions for the parameters. We train a SOM with a simulated mass-limited lightcone assuming a ugrizYJHKs+IRAC dataset, mimicking the Hyper Suprime-Cam (HSC) Deep joint dataset. For parameter estimation, we derive SOM likelihood surfaces considering photometric errors to derive total (statistical and systematic) uncertainties. We explore the effects of missing data including which bands are particular critical to the accuracy of the derived parameters. We demonstrate that the parameter recovery is significantly better when the missing bands are "filled-in" rather than if they are completely omitted. We propose a practical method for such recovery of missing data.
Cite
@article{arxiv.2403.18888,
title = {Estimating Galaxy Parameters with Self-Organizing Maps and the Effect of Missing Data},
author = {Valentina La Torre and Anna Sajina and Andy D. Goulding and Danilo Marchesini and Rachel Bezanson and Alan N. Pearl and Laerte Sodré},
journal= {arXiv preprint arXiv:2403.18888},
year = {2024}
}
Comments
22 pages, 12 figures, 1 table, accepted for publication in The Astronomical Journal