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  Machine-learning classifiers for intermediate redshift emission-line galaxies

Zhang, K., Schlegel, D. J., Andrews, B. H., Comparat, J., Schäfer, C., Mata, J. A. V., et al. (2019). Machine-learning classifiers for intermediate redshift emission-line galaxies. The Astrophysical Journal, 883(1): 63. doi:10.3847/1538-4357/ab397e.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4B3A-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-4B3B-6
Genre: Journal Article

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The Radial Distribution of Dust Particles in the HL Tau Disk from ALMA and VLA Observations.pdf (Any fulltext), 3MB
 
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 Creators:
Zhang, Kai, Author
Schlegel, David J., Author
Andrews, Brett H., Author
Comparat, Johan1, Author              
Schäfer, Christoph, Author
Mata, Jose Antonio Vazquez, Author
Kneib, Jean-Paul, Author
Yan, Renbin, Author
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: Classification of intermediate redshift (z = 0.3–0.8) emission line galaxies as star-forming galaxies, composite galaxies, active galactic nuclei (AGNs), or low-ionization nuclear emission regions (LINERs) using optical spectra alone was impossible because the lines used for standard optical diagnostic diagrams: [N ii], Hα, and [S ii] are redshifted out of the observed wavelength range. In this work, we address this problem using four supervised machine-learning classification algorithms: k-nearest neighbors (KNN), support vector classifier (SVC), random forest (RF), and a multilayer perceptron (MLP) neural network. For input features, we use properties that can be measured from optical galaxy spectra out to z < 0.8—[O iii]/Hβ, [O ii]/Hβ, [O iii] line width, and stellar velocity dispersion—and four colors (u − g, g − r, r − i, and i − z) corrected to z = 0.1. The labels for the low redshift emission line galaxy training set are determined using standard optical diagnostic diagrams. RF has the best area under curve score for classifying all four galaxy types, meaning the highest distinguishing power. Both the AUC scores and accuracies of the other algorithms are ordered as MLP > SVC > KNN. The classification accuracies with all eight features (and the four spectroscopically determined features only) are 93.4% (92.3%) for star-forming galaxies, 69.4% (63.7%) for composite galaxies, 71.8% (67.3%) for AGNs, and 65.7% (60.8%) for LINERs. The stacked spectrum of galaxies of the same type as determined by optical diagnostic diagrams at low redshift and RF at intermediate redshift are broadly consistent. Our publicly available code (https://github.com/zkdtc/MLC_ELGs) and trained models will be instrumental for classifying emission line galaxies in upcoming wide-field spectroscopic surveys.

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 Dates: 2019-09-20
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab397e
Other: LOCALID: 3180131
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 883 (1) Sequence Number: 63 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3