arXiv:2107.12112 | ApJL 917 L19
This repository contains the code to reproduce results of the search for a stochastic gravitational-wave background with the second data release (DR2) of the Parkes Pulsar Timing Array (PPTA).
run_analysis.pyis the main script to run parameter estimation and model selection.params/contains confguration files for parameter estimation and/or model selection, priors, output directories, etc.slurm/contains slurm submission scripts, with examples of how to launch "run_analysis.py" from the command line.
The code is based on enterprise_warp. It was used with Python 3.6, bilby-1.1.1. It also requires a custom fork of enterprise_extensions, with some minor modifications. The most important differences are the hard-coded custom jump proposal uniform prior boundaries for the amplitude of gravitational-wave signal components in enterprise_extensions. Please make sure they are the same the actual prior boundaries for the analysis, as defined in enterprise_warp/enterprise_models.py or a parameter file where one can modify them. Otherwise, your will observe the biased posterior distribution.
This repository contains posterior samples outlining our measurement of the amplitude, log10_A_gw, and the power-law index, gamma_gw, of the common-spectrum process. It also contains posterior samples for our constraints on spatial correlation coefficients at different angles between pulsar pairs. The samples are in .txt files in /publication_figures/, for the common-spectrum process two files should be merged into one.
@misc{goncharov2021evidence,
title={On the evidence for a common-spectrum process in the search for the nanohertz gravitational-wave background with the Parkes Pulsar Timing Array},
author={Boris Goncharov and R. M. Shannon and D. J. Reardon and G. Hobbs and A. Zic and M. Bailes and M. Curylo and S. Dai and M. Kerr and M. E. Lower and R. N. Manchester and R. Mandow and H. Middleton and M. T. Miles and A. Parthasarathy and E. Thrane and N. Thyagarajan and X. Xue and X. J. Zhu and A. D. Cameron and Y. Feng and R. Luo and C. J. Russell and J. Sarkissian and R. Spiewak and S. Wang and J. B. Wang and L. Zhang and S. Zhang},
journal = {\apjl},
year={2021},
volume = {917},
number = {2},
pages = {8},
doi = {10.3847/2041-8213/ac17f4},
eprint={2107.12112},
archivePrefix={arXiv},
primaryClass={astro-ph.HE}
}