nway 4.4

Probabilistic Cross-Identification of Astronomical Sources

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

Features

• 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

Documentation

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.

Installation

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

• progressbar2 or progressbar or progressbar-latest

• joblib

• healpy

• pandas

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

Reporting issues

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

Citing nway correctly

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

Licence

This program is free and open-source software, licensed under AGPLv3 (see LICENSE and COPYING files). Written by Johannes Buchner (C) 2013-2017