nway is a source cross-matching tool for arbitrarily many astronomical catalogues.

• Bayesian match probabilities based on astronomical sky coordinates (RA, DEC)
• Works with arbitrarily many catalogues
• Can handle varying errors
• Can incorporate additional prior information, such as the magnitude or color distributions of the sources to match
• Works accurately and fast in small areas and all-sky catalogues

See the manual in the doc/ folder, https://github.com/JohannesBuchner/nway/raw/master/doc/nway-manual.pdf

A full worked example with demo catalogues is included.

The easiest way to install nway is with pip:

$ pip install nway

Add --user if you do not have admin privileges. Alternatively, download the source code and run "python setup.py install".

nway uses the following python packages:

• numpy, scipy, matplotlib
• astropy
• tqdm
• joblib
• healpy
• pandas

nway works with both Python 3 and Python 2 and various astropy versions.

Please file an issue on Github if you have any problems.

Please cite Salvato et al (2017). https://arxiv.org/abs/1705.10711 (Get BibTex)

This program is free and open-source software, licensed under AGPLv3 (see LICENSE and COPYING files). Written by Johannes Buchner (C) 2013-2020