The reviewed record of science sign in
Pith

arxiv: 2411.13472 · v1 · pith:4GSXXZ6F · submitted 2024-11-20 · astro-ph.HE · astro-ph.GA· gr-qc

The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations

Gabriella Agazie , Jeremy G. Baier , Paul T. Baker , Bence Becsy , Laura Blecha , Kimberly K. Boddy , Adam Brazier , Paul R. Brook
show 81 more authors
Sarah Burke-Spolaor Rand Burnette J. Andrew Casey-Clyde Maria Charisi Shami Chatterjee Tyler Cohen James M. Cordes Neil J. Cornish Fronefield Crawford H. Thankful Cromartie Megan E. DeCesar Paul B. Demorest Heling Deng Lankeswar Dey Timothy Dolch Elizabeth C. Ferrara William Fiore Emmanuel Fonseca Gabriel E. Freedman Emiko C. Gardiner Kyle A. Gersbach Joseph Glaser Deborah C. Good Kayhan Gultekin Jeffrey S. Hazboun Ross J. Jennings Aaron D. Johnson David L. Kaplan Luke Zoltan Kelley Joey S. Key Nima Laal Michael T. Lam William G. Lamb Bjorn Larsen T. Joseph W. Lazio Natalia Lewandowska Tingting Liu Jing Luo Ryan S. Lynch Chung-Pei Ma Dustin R. Madison Alexander McEwen James W. McKee Maura A. McLaughlin Patrick M. Meyers Chiara M. F. Mingarelli Andrea Mitridate Jonathan Nay David J. Nice Stella Koch Ocker Ken D. Olum Timothy T. Pennucci Polina Petrov Nihan S. Pol Henri A. Radovan Scott M. Ransom Paul S. Ray Jessie C. Runnoe Alexander Saffer Shashwat C. Sardesai Kai Schmitz Xavier Siemens Joseph Simon Magdalena S. Siwek Tristan L. Smith Sophia V. Sosa Fiscella Ingrid H. Stairs Daniel R. Stinebring Abhimanyu Susobhanan Joseph K. Swiggum Jacob Taylor Stephen R. Taylor Jacob E. Turner Caner Unal Michele Vallisneri Rutger van Haasteren Joris Verbiest Sarah J. Vigeland Caitlin A. Witt David Wright Olivia Young
This is my paper

Reviewed by Pith T0 review T1 audit T2 compute T3 formal T4 kernel pith:4GSXXZ6Frecord.jsonopen to challenge →

classification astro-ph.HE astro-ph.GAgr-qc
keywords correlationsangularevidencedatageneralnanogravpulsarrelativity
0
0 comments X
read the original abstract

Pulsar timing array observations have found evidence for an isotropic gravitational wave background with the Hellings-Downs angular correlations, expected from general relativity. This interpretation hinges on the measured shape of the angular correlations, which is predominately quadrupolar under general relativity. Here we explore a more flexible parameterization: we expand the angular correlations into a sum of Legendre polynomials and use a Bayesian analysis to constrain their coefficients with the 15-year pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav). When including Legendre polynomials with multipoles $\ell \geq 2$, we only find a significant signal in the quadrupole with an amplitude consistent with general relativity and non-zero at the $\sim 95\%$ confidence level and a Bayes factor of 200. When we include multipoles $\ell \leq 1$, the Bayes factor evidence for quadrupole correlations decreases by more than an order of magnitude due to evidence for a monopolar signal at approximately 4 nHz which has also been noted in previous analyses of the NANOGrav 15-year data. Further work needs to be done in order to better characterize the properties of this monopolar signal and its effect on the evidence for quadrupolar angular correlations.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Prospects for multi-messenger discovery of the gravitational-wave background anisotropies via cross-correlation with galaxies

    astro-ph.CO 2026-05 unverdicted novelty 6.0

    New simulations show that cross-correlating gravitational wave background anisotropies with galaxy distributions can enable discovery at angular scales of 4-6 degrees with next-generation observatories.