Finding Stellar Streams in the Milky Way with CWoLa
DOI10.5281/zenodo.7897840Zenodo7897840MaRDI QIDQ6726307
Dataset published at Zenodo repository.
Author name not available (Why is that?)
Publication date: 5 May 2023
Copyright license: No records found.
These datasets are designed to accompany the paperWeakly-Supervised Anomaly Detection in the Milky Wayby M. Pettee, S. Thanvantri, B. Nachman, D. Shih, M. R. Buckley, and J. H. Collins (https://arxiv.org/abs/2305.03761). They illustrate how the Classification Without Labels(CWoLa) technique can be applied in the search for localized anomalies -- in this case,cold stellar streams -- in theGaiaDR2 dataset. We consider both simulated stellar streams and the known stream GD-1. The codebase is located athttps://github.com/hep-lbdl/GaiaCWoLa. These datasets are all formatted as Pandas DataFrames, and can be loaded using `df = pd.read_hdf(file)`. Datasets ending in `*_cwola.h5*` indicate that CWoLa has been applied to the stars in that dataset. For this analysis, we consider circular patches of the sky of radius 15 from the Gaia DR2 dataset. Columns include: _: Proper motion (declination) _: Proper motion (right ascension) : Declination : Right ascension _wrapped: Right ascension, wrapped such that all angles are 0 b-r: Color g: Magnitude ϕ: Rotated centered right ascension : Rotated centered declination _ϕcos:Rotated centered proper motion (right ascension) _:Rotated centered proper motion (declination) stream: Boolean label (True if part of ground truth labeling for GD-1) patch_id: Index of the 21 patches of the GD-1 scan nn_score: CWoLa classifier score (0 = more background-like; 1 = more signal=like) 5d_distance: For the potential GD-1 member candidates, the 5D Euclidean distance to the nearest labeled star Files include: gd1_1_patch.h5 Example patch of GD-1 gd1_21_patches_cwola.h5 Results from applying CWoLa to the 21 patches spanning GD-1 promising_stars.h5 A list of stars identified by CWoLa that do not belong to the labeledGD-1 stream catalogue, but are close in 5D Euclidean space to labeled stars. Ordered in descending order by CWoLa classifier score. scan_bump_cwola.h5 An example of how to apply CWoLa in a scan where the stream location is unknown scan_no_bump_cwola.h5 An example of how to apply CWoLa in a scan where the stream location is unknown simulated_100_patches.h5 Results from applying CWoLa to 100 simulated streams simulated_patch.h5 A full simulated stream simulated_patch_cwola.h5 Results from applying CWoLa to the example simulated stream To recreate the full scan across GD-1, one would need to use the original 21 patches of Gaia DR2 located at10.5281/zenodo.7897935that were constructed for arXiv:2104.12789 [astro-ph.GA). GD-1 labels were derived from10.5281/zenodo.1295543.
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