publication . Article . Preprint . Other literature type . 2022

The International Pulsar Timing Array second data release: Search for an isotropic gravitational wave background

J Antoniadis; Z Arzoumanian; S Babak; M Bailes; A-S Bak Nielsen; P T Baker; C G Bassa; B Bécsy; A Berthereau; M Bonetti; ...
Open Access English
  • Published: 19 Jan 2022
Abstract
We searched for an isotropic stochastic gravitational wave background in the second data release of the International Pulsar Timing Array, a global collaboration synthesizing decadal-length pulsar-timing campaigns in North America, Europe, and Australia. In our reference search for a power law strain spectrum of the form $h_c = A(f/1\,\mathrm{yr}^{-1})^{\alpha}$, we found strong evidence for a spectrally-similar low-frequency stochastic process of amplitude $A = 3.8^{+6.3}_{-2.5}\times10^{-15}$ and spectral index $\alpha = -0.5 \pm 0.5$, where the uncertainties represent 95\% credible regions, using information from the auto- and cross-correlation terms between ...
Subjects
free text keywords: gravitational waves, methods: data analysis, pulsars: general, [PHYS]Physics [physics], High Energy Astrophysical Phenomena (astro-ph.HE), Instrumentation and Methods for Astrophysics (astro-ph.IM), FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, Space and Planetary Science, Astronomy and Astrophysics, astro-ph.IM, Astrophysics and Astronomy, astro-ph.HE
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Funded by
ARC| Discovery Early Career Researcher Award - Grant ID: DE210101738
Project
  • Funder: Australian Research Council (ARC) (ARC)
  • Project Code: DE210101738
  • Funding stream: Discovery Early Career Researcher Award
,
NSERC
Project
  • Funder: Natural Sciences and Engineering Research Council of Canada (NSERC)
,
ANR| PTA-France
Project
PTA-France
Gravitational wave search with a Pulsar Timing Array in France
  • Funder: French National Research Agency (ANR) (ANR)
  • Project Code: ANR-18-CE31-0015
,
EC| B Massive
Project
B Massive
Binary massive black hole astrophysics
  • Funder: European Commission (EC)
  • Project Code: 818691
  • Funding stream: H2020 | ERC | ERC-COG
Validated by funder
,
ARC| Discovery Early Career Researcher Award - Grant ID: DE210101738
Project
  • Funder: Australian Research Council (ARC) (ARC)
  • Project Code: DE210101738
  • Funding stream: Discovery Early Career Researcher Award
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