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Halotools

On the record

Analysis examples
The tutorials demonstrate galaxy clustering, galaxy-galaxy lensing, group identification, velocity statistics, void statistics, and isolation criteria.halotools.readthedocs.io · read 4 Oct 2026
Catalog handling
Halotools supports reducing halo catalogs and caching them as fast-loading HDF5 files.halotools.readthedocs.io · read 4 Oct 2026
Custom catalogs
Users can transform halo catalogs beyond those provided by Halotools into a standard form for its mock-population factories.halotools.readthedocs.io · read 4 Oct 2026
Custom models
Its modular, object-oriented framework lets users design galaxy evolution models from interchangeable components.halotools.readthedocs.io · read 4 Oct 2026
Dependencies
The installation documentation lists h5py 3.7 or later as an additional dependency that may be needed with conda or pip.halotools.readthedocs.io · read 4 Oct 2026
Installation
The documentation recommends installing the latest release with conda-forge and also provides pip and source-build instructions.halotools.readthedocs.io · read 4 Oct 2026
License
Halotools is fully open source and distributed under a 3-clause BSD-style license.halotools.readthedocs.io · read 4 Oct 2026
Mock galaxies
It generates synthetic galaxy populations using HODs, abundance matching, and related methods.halotools.readthedocs.io · read 4 Oct 2026
Notable model requirement
Different models require different halo properties, so users must format their catalog to supply the properties needed by the model they choose.halotools.readthedocs.io · read 4 Oct 2026
Observables
Its algorithms calculate galaxy clustering, lensing, redshift-space distortions, and other astronomical statistics.halotools.readthedocs.io · read 4 Oct 2026
Purpose
Halotools is a specialized Python package for building and testing galaxy-halo connection models and analyzing dark matter halo catalogs.halotools.readthedocs.io · read 4 Oct 2026
Research audience
The package is designed to study cosmology, galaxy evolution, and structure formation using simulations and mock galaxy populations.halotools.readthedocs.io · read 4 Oct 2026
Simulation data
The package supports downloading publicly available raw simulation catalogs, reducing them to memory-mapped files, and managing a simulation cache.halotools.readthedocs.io · read 4 Oct 2026
Support
Users can request support by Slack or personal email, or raise a public GitHub issue tagged as a feature request or question.halotools.readthedocs.io · read 4 Oct 2026

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