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  A Gamma-ray Pulsar Timing Array Constrains the Nanohertz Gravitational Wave Background

Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., et al. (2022). A Gamma-ray Pulsar Timing Array Constrains the Nanohertz Gravitational Wave Background. Science, 376(6592 ), 521-523. doi:10.1126/science.abm3231.

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Ajello, M., Author
Atwood, W. B., Author
Baldini, L., Author
Ballet, J., Author
Barbiellini, G., Author
Bastieri, D., Author
Bellazzini, R., Author
Berretta, A., Author
Bhattacharyya, B., Author
Bissaldi, E., Author
Blandford, R. D., Author
Bloom, E., Author
Bonino, R., Author
Bruel, P., Author
Buehler, R., Author
Burns, E., Author
Buson, S., Author
Cameron, R. A., Author
Caraveo, P. A., Author
Cavazzuti, E., Author
Cibrario, N., AuthorCiprini, S., AuthorClark, C. J.1, Author              Cognard, I., AuthorCoronado-Blázquez, J., AuthorCrnogorcevic, M., AuthorCromartie, H., AuthorCrowter, K., AuthorCutini, S., AuthorD'Ammando, F., AuthorGaetano, S. D., AuthorPalma, F. d., AuthorDigel, S. W., AuthorLalla, N. D., AuthorDirirsa, F. Fan., AuthorVenere, L. D., AuthorDomínguez, A., AuthorFerrara, E. C., AuthorFiori, A., AuthorFranckowiak, A., AuthorFukazawa, Y., AuthorFunk, S., AuthorFusco, P., AuthorGammaldi, V., AuthorGargano, F., AuthorGasparrini, D., AuthorGiglietto, N., AuthorGiordano, F., AuthorGiroletti, M., AuthorGreen, D., AuthorGrenier, I. A., AuthorGuillemot, L., AuthorGuiriec, S., AuthorGustafsson, M., AuthorHarding, A. K., AuthorHays, E., AuthorHewitt, J. W., AuthorHoran, D., AuthorHou, X., AuthorJóhannesson, G., AuthorKeith, M. J., AuthorKerr, M., AuthorKramer, M., AuthorKuss, M., AuthorLarsson, S., AuthorLatronico, L., AuthorLi, J., AuthorLongo, F., AuthorLoparco, F., AuthorLovellette, M. N., AuthorLubrano, P., AuthorMaldera, S., AuthorManfreda, A., AuthorMartí-Devesa, G., AuthorMazziotta, M. N., AuthorMereu, I., AuthorMichelson, P. F., AuthorMirabal, N., AuthorMitthumsiri, W., AuthorMizuno, T., AuthorMonzani, M. E., AuthorMorselli, A., AuthorNegro, M., AuthorNieder, L.1, Author              Ojha, R., AuthorOmodei, N., AuthorOrienti, M., AuthorOrlando, E., AuthorOrmes, J. F., AuthorPaneque, D., AuthorParthasarathy, A., AuthorPei, Z., AuthorPersic, M., AuthorPesce-Rollins, M., AuthorPillera, R., AuthorPoon, H., AuthorPorter, T. A., AuthorPrincipe, G., AuthorRacusin, J. L., AuthorRainò, S., AuthorRando, R., AuthorRani, B., AuthorRansom, S. M., AuthorRay, P. S., AuthorRazzano, M., AuthorRazzaque, S., AuthorReimer, A., AuthorReimer, O., AuthorRoy, J., AuthorSánchez-Conde, M., AuthorParkinson, P. M. Sa., AuthorScargle, J., AuthorScotton, L., AuthorSerini, D., AuthorSgrò, C., AuthorSiskind, E. J., AuthorSmith, D. A., AuthorSpandre, G., AuthorSpiewak, R., AuthorSpinelli, P., AuthorStairs, I., AuthorSuson, D. J., AuthorSwihart, S. J., AuthorTabassum, S., AuthorThayer, J. B., AuthorTheureau, G., AuthorTorres, D. F., AuthorTroja, E., AuthorValverde, J., AuthorWadiasingh, Z., AuthorWood, K., AuthorZaharijas, G., Author more..
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: After large galaxies merge, their central supermassive black holes are expected to form binary systems whose orbital motion generates a gravitational wave background (GWB) at nanohertz frequencies. Searches for this background utilize pulsar timing arrays, which perform long-term monitoring of millisecond pulsars (MSPs) at radio wavelengths. We use 12.5 years of Fermi Large Area Telescope data to form a gamma-ray pulsar timing array. Results from 35 bright gamma-ray pulsars place a 95\% credible limit on the GWB characteristic strain of $1.0\times10^{-14}$ at 1 yr$^{-1}$, which scales as the observing time span $t_{\mathrm{obs}}^{-13/6}$. This direct measurement provides an independent probe of the GWB while offering a check on radio noise models.

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 Dates: 2022-04-112022
 Publication Status: Published in print
 Pages: 3 figures in the main text. 3 figures and 8 tables are in the supplementary material
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 2204.05226
DOI: 10.1126/science.abm3231
 Degree: -

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Title: Science
Source Genre: Journal
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Pages: - Volume / Issue: 376 (6592 ) Sequence Number: - Start / End Page: 521 - 523 Identifier: -