Nessie: A rust-powered, fast, flexible, and generalized friends-of-friends galaxy-group finder in R and Python

We introduce Nessie, a galaxy group finder implemented in Rust and distributed as both a Python and R package. Nessie employs the friends-of-friends (FoF) algorithm and requires only on-sky position and redshift as input, making it immediately applicable to surveys that lack a well-defined luminosit...

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Published inAstronomy and computing Vol. 54; p. 101011
Main Authors Lambert, Trystan S., Robotham, A.S.G., Bravo, M., Lagos, C. del P., Tobar, R., Driver, S., d’Hautefort, A. Aufan Stoffels
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.01.2026
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Online AccessGet full text
ISSN2213-1337
2213-1345
DOI10.1016/j.ascom.2025.101011

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Abstract We introduce Nessie, a galaxy group finder implemented in Rust and distributed as both a Python and R package. Nessie employs the friends-of-friends (FoF) algorithm and requires only on-sky position and redshift as input, making it immediately applicable to surveys that lack a well-defined luminosity function. We implement several algorithmic optimizations – including binary search and k-d tree pre-selection – that significantly improve performance by reducing unnecessary galaxy pair checks. To validate the accuracy of Nessie, we tune its parameters using a suite of GALFORM mock lightcones and achieve a strong Figure of Merit. We further demonstrate its reliability by applying it to both the GAMA and SDSS surveys, where it produces group catalogues consistent with those in the literature. Additional functionality is included for comparison with simulations and mock catalogues. Benchmarking on a standard MacBook Pro (M3 chip with 11 cores) shows that version 1 of Nessie can process ∼1 million galaxies in ∼10 s, highlighting its speed and suitability for next-generation redshift surveys.
AbstractList We introduce Nessie, a galaxy group finder implemented in Rust and distributed as both a Python and R package. Nessie employs the friends-of-friends (FoF) algorithm and requires only on-sky position and redshift as input, making it immediately applicable to surveys that lack a well-defined luminosity function. We implement several algorithmic optimizations – including binary search and k-d tree pre-selection – that significantly improve performance by reducing unnecessary galaxy pair checks. To validate the accuracy of Nessie, we tune its parameters using a suite of GALFORM mock lightcones and achieve a strong Figure of Merit. We further demonstrate its reliability by applying it to both the GAMA and SDSS surveys, where it produces group catalogues consistent with those in the literature. Additional functionality is included for comparison with simulations and mock catalogues. Benchmarking on a standard MacBook Pro (M3 chip with 11 cores) shows that version 1 of Nessie can process ∼1 million galaxies in ∼10 s, highlighting its speed and suitability for next-generation redshift surveys.
ArticleNumber 101011
Author d’Hautefort, A. Aufan Stoffels
Lambert, Trystan S.
Tobar, R.
Robotham, A.S.G.
Bravo, M.
Lagos, C. del P.
Driver, S.
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  organization: International Centre for Radio Astronomy Research (ICRAR), M468, University of Western Australia, 35 Stirling Hwy, Crawley, Perth, 6009, WA, Australia
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Galaxies
Galaxy-groups
Large-scale structure
Software
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Title Nessie: A rust-powered, fast, flexible, and generalized friends-of-friends galaxy-group finder in R and Python
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