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  Limits on anisotropy in the nanohertz stochastic gravitational-wave background

Taylor, S. R., Mingarelli, C. M. F., Gair, J. R., Sesana, A., Theureau, G., Babak, S., et al. (2015). Limits on anisotropy in the nanohertz stochastic gravitational-wave background. Physical Review Letters, 115: 041101. doi:10.1103/PhysRevLett.115.041101.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-C3BA-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-1FD1-1
Genre: Journal Article

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 Creators:
Taylor, S. R., Author
Mingarelli, C. M. F., Author
Gair, J. R., Author
Sesana, A.1, Author              
Theureau, G., Author
Babak, S.1, Author              
Bassa, C. G., Author
Brem, P.1, Author
Burgay, M., Author
Caballero, R. N., Author
Champion, D. J., Author
Cognard, I., Author
Desvignes, G., Author
Guillemot, L., Author
Hessels, J. W. T., Author
Janssen, G. H., Author
Karuppusamy, R., Author
Kramer, M., Author
Lassus, A., Author
Lazarus, P., Author
Lentati, L., AuthorLiu, K., AuthorOsłowski, S., AuthorPerrodin, D., AuthorPetiteau, A., AuthorPossenti, A., AuthorPurver, M. B., AuthorRosado, P. A.2, Author              Sanidas, S. A., AuthorSmits, R., AuthorStappers, B., AuthorTiburzi, C., AuthorHaasteren, R. van, AuthorVecchio, A., AuthorVerbiest, J. P. W., Author more..
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013              
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24011              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,General Relativity and Quantum Cosmology, gr-qc
 Abstract: The paucity of observed supermassive black hole binaries (SMBHBs) may imply that the gravitational wave background (GWB) from this population is anisotropic, rendering existing analyses sub-optimal. We present the first constraints on the angular distribution of a nanohertz stochastic GWB from circular, inspiral-driven SMBHBs using the $2015$ European Pulsar Timing Array data [Desvignes et al. (in prep.)]. Our analysis of the GWB in the $\sim 2 - 90$ nHz band shows consistency with isotropy, with the strain amplitude in $l>0$ spherical harmonic multipoles $\lesssim 40\%$ of the monopole value. We expect that these more general techniques will become standard tools to probe the angular distribution of source populations.

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 Dates: 2015-06-292015
 Publication Status: Published in print
 Pages: 6 pages, 2 figures, 1 table. Accepted for publication in Physical Review Letters
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1506.08817
DOI: 10.1103/PhysRevLett.115.041101
 Degree: -

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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 115 Sequence Number: 041101 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925433406_1