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  The International Pulsar Timing Array second data release: Search for an isotropic Gravitational Wave Background

Antoniadis, J., Arzoumanian, Z., Babak, S., Bailes, M., Nielsen, A.-.-S.-B., Baker, P. T., et al. (2022). The International Pulsar Timing Array second data release: Search for an isotropic Gravitational Wave Background. Monthly Notices of the Royal Astronomical Society, 510(4), 4873-4887. doi:10.1093/mnras/stab3418.

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Antoniadis, J., Author
Arzoumanian, Z., Author
Babak, S., Author
Bailes, M., Author
Nielsen, A. -S. Bak, Author
Baker, P. T., Author
Bassa, C. G., Author
Becsy, B., Author
Berthereau, A., Author
Bonetti, M., Author
Brazier, A., Author
Brook, P. R., Author
Burgay, M., Author
Burke-Spolaor, S., Author
Caballero, R. N., Author
Casey-Clyde, J. A., Author
Chalumeau, A., Author
Champion, D. J., Author
Charisi, M., Author
Chatterjee, S., Author
Chen, S., AuthorCognard, I., AuthorCordes, J. M., AuthorCornish, N. J., AuthorCrawford, F., AuthorCromartie, H. T., AuthorCrowter, K., AuthorDai, S., AuthorDeCesar, M. E., AuthorDemorest, P. B., AuthorDesvignes, G., AuthorDolch, T., AuthorDrachler, B., AuthorFalxa, M., AuthorFerrara, E. C., AuthorFiore, W., AuthorFonseca, E., AuthorGair, J. R., AuthorGarver-Daniels, N., AuthorGoncharov, B., AuthorGood, D. C., AuthorGraikou, E., AuthorGuillemot, L., AuthorGuo, Y. J., AuthorHazboun, J. S., AuthorHobbs, G., AuthorHu, H., AuthorIslo, K., AuthorJanssen, G. H., AuthorJennings, R. J., AuthorJohnson, A. D., AuthorJones, M. L., AuthorKaiser, A. R., AuthorKaplan, D. L., AuthorKaruppusamy, R., AuthorKeith, M. J., AuthorKelley, L. Z., AuthorKerr, M., AuthorKey, J. S., AuthorKramer, M., AuthorLam, M. T., AuthorLamb, W. G., AuthorLazio, T. J. W., AuthorLee, K. J., AuthorLentati, L., AuthorLiu, K., AuthorLuo, J., AuthorLynch, R. S., AuthorLyne, A. G., AuthorMadison, D. R., AuthorMain, R. A., AuthorManchester, R. N., AuthorMcEwen, A., AuthorMcKee, J. W., AuthorMcLaughlin, M. A., AuthorMickaliger, M. B., AuthorMingarelli, C. M. F., AuthorNg, C., AuthorNice, D. J., Authorlowski, S. Os, AuthorParthasarathy, A., AuthorPennucci, T. T., AuthorPerera, B. B. P., AuthorPerrodin, D., AuthorPetiteau, A., AuthorPol, N. S., AuthorPorayko, N. K., AuthorPossenti, A., AuthorRansom, S. M., AuthorRay, P. S., AuthorReardon, D. J., AuthorRussell, C. J., AuthorSamajdar, A., AuthorSampson, L. M., AuthorSanidas, S., AuthorSarkissian, J. M., AuthorSchmitz, K., AuthorSchult, L., AuthorSesana, A., AuthorShaifullah, G., AuthorShannon, R. M., AuthorShapiro-Albert, B. J., AuthorSiemens, X., AuthorSimon, J., AuthorSmith, T. L., AuthorSperi, L.1, Author              Spiewak, R., AuthorStairs, I. H., AuthorStappers, B. W., AuthorStinebring, D. R., AuthorSwiggum, J. K., AuthorTaylor, S. R., AuthorTheureau, G., AuthorTiburzi, C., AuthorVallisneri, M., Authorvan der Wateren, E., AuthorVecchio, A., AuthorVerbiest, J. P. W., AuthorVigeland, S. J., AuthorWahl, H., AuthorWang, J. B., AuthorWang, J., AuthorWang, L., AuthorWitt, C. A., AuthorZhang, S., AuthorZhu, X. J., Author more..
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM
 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 the pulsars in the array. For a spectral index of $\alpha = -2/3$, as expected from a population of inspiralling supermassive black hole binaries, the recovered amplitude is $A = 2.8^{+1.2}_{-0.8}\times10^{-15}$. Nonetheless, no significant evidence of the Hellings-Downs correlations that would indicate a gravitational-wave origin was found. We also analyzed the constituent data from the individual pulsar timing arrays in a consistent way, and clearly demonstrate that the combined international data set is more sensitive. Furthermore, we demonstrate that this combined data set produces comparable constraints to recent single-array data sets which have more data than the constituent parts of the combination. Future international data releases will deliver increased sensitivity to gravitational wave radiation, and significantly increase the detection probability.

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 Dates: 2022-01-112022
 Publication Status: Published in print
 Pages: 17 pages, 12 figures, accepted in MNRAS
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2201.03980
DOI: 10.1093/mnras/stab3418
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 510 (4) Sequence Number: - Start / End Page: 4873 - 4887 Identifier: -