- Published
- 2023-06-28
- Venue
- The Astrophysical Journal Letters, vol. 951, no. 1, pp. L6
- Cited by
- 1,158
- Open access
- Yes, gold
- DOI
- 10.3847/2041-8213/acdd02
Abstract
Pulsar timing arrays aim to detect nanohertz-frequency gravitational waves (GWs). A background of GWs modulates pulsar arrival times and manifests as a stochastic process, common to all pulsars, with a signature spatial correlation. Here we describe a search for an isotropic stochastic gravitational-wave background (GWB) using observations of 30 millisecond pulsars from the third data release of the Parkes Pulsar Timing Array (PPTA), which spans 18 yr. Using current Bayesian inference techniques we recover and characterize a common-spectrum noise process. Represented as a strain spectrum h c = A ( f / 1 yr − 1 ) α , we measure A = 3.1 − 0.9 + 1.3 × 10 − 15 and α = −0.45 ± 0.20, respectively (median and 68% credible interval). For a spectral index of α = −2/3, corresponding to an isotropic background of GWs radiated by inspiraling supermassive black hole binaries, we recover an amplitude of A = 2.04 − 0.22 + 0.25 × 10 − 15 . However, we demonstrate that the apparent signal strength is time-dependent, as the first half of our data set can be used to place an upper limit on A that is in tension with the inferred common-spectrum amplitude using the complete data set. We search for spatial correlations in the observations by hierarchically analyzing individual pulsar pairs, which also allows for significance validation through randomizing pulsar positions on the sky. For a process with α = −2/3, we measure spatial correlations consistent with a GWB, with an estimated false-alarm probability of p ≲ 0.02 (approx. 2 σ ). The long timing baselines of the PPTA and the access to southern pulsars will continue to play an important role in the International Pulsar Timing Array.
Cite this paper
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- APA 7
Reardon, D. J., Zic, A., Shannon, R. M., Hobbs, G. B., Bailes, M., Marco, V. D., Kapur, A., Rogers, A. F., Thrane, E., Askew, J., Bhat, N. D. R., Cameron, A. D., Curyło, M., Coles, W. A., Dai, S., Goncharov, B., Kerr, M. T., Kulkarni, A., Levin, Y., … Zhu, X. J. (2023). Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array. The Astrophysical Journal Letters, 951(1), L6. https://doi.org/10.3847/2041-8213/acdd02
- MLA 9
Reardon, Daniel J., et al. "Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array." The Astrophysical Journal Letters, vol. 951, no. 1, 2023, pp. L6, https://doi.org/10.3847/2041-8213/acdd02.
- Chicago
Reardon, Daniel J., Andrew Zic, R. M. Shannon, George B. Hobbs, M. Bailes, Valentina Di Marco, Agastya Kapur, et al. "Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array." The Astrophysical Journal Letters 951, no. 1 (2023): L6. https://doi.org/10.3847/2041-8213/acdd02.
- GOST
Reardon D. J., Zic A., Shannon R. M. [и др.] Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array // The Astrophysical Journal Letters. — 2023. — Vol. 951, № 1. — P. L6. — URL: https://doi.org/10.3847/2041-8213/acdd02
- BibTeX
@article{reardon2023search, title = {{Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array}}, author = {Daniel J. Reardon and Andrew Zic and R. M. Shannon and George B. Hobbs and M. Bailes and Valentina Di Marco and Agastya Kapur and Axl F. Rogers and Eric Thrane and Jacob Askew and N. D. R. Bhat and Andrew D Cameron and M. Curyło and W. A. Coles and Shi Dai and Boris Goncharov and Matthew T. Kerr and Atharva Kulkarni and Yuri Levin and M. E. Lower and Richard N. Manchester and Rami Mandow and Matthew T. Miles and Rowina S Nathan and S. Osłowski and Craig Russell and R. Spiewak and Songbo Zhang and X. J. Zhu}, journal = {The Astrophysical Journal Letters}, year = {2023}, volume = {951}, number = {1}, pages = {L6}, doi = {10.3847/2041-8213/acdd02}, url = {https://doi.org/10.3847/2041-8213/acdd02} }- RIS
TY - JOUR AU - Reardon, Daniel J. AU - Zic, Andrew AU - Shannon, R. M. AU - Hobbs, George B. AU - Bailes, M. AU - Marco, Valentina Di AU - Kapur, Agastya AU - Rogers, Axl F. AU - Thrane, Eric AU - Askew, Jacob AU - Bhat, N. D. R. AU - Cameron, Andrew D AU - Curyło, M. AU - Coles, W. A. AU - Dai, Shi AU - Goncharov, Boris AU - Kerr, Matthew T. AU - Kulkarni, Atharva AU - Levin, Yuri AU - Lower, M. E. AU - Manchester, Richard N. AU - Mandow, Rami AU - Miles, Matthew T. AU - Nathan, Rowina S AU - Osłowski, S. AU - Russell, Craig AU - Spiewak, R. AU - Zhang, Songbo AU - Zhu, X. J. TI - Search for an Isotropic Gravitational-wave Background with the Parkes Pulsar Timing Array JO - The Astrophysical Journal Letters VL - 951 IS - 1 SP - L6 PY - 2023 DA - 2023/06/28 DO - 10.3847/2041-8213/acdd02 UR - https://doi.org/10.3847/2041-8213/acdd02 ER -
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