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.; Bassa, C. G.; Brem, P.; Burgay, M.; Caballero, R. N.; Champion, D. J.; Cognard, I.; Desvignes, G.; Guillemot, L.; Hessels, J. W. T.; Janssen, G. H.; Karuppusamy, R.; Kramer, M.; Lassus, A.; Lazarus, P.; Lentati, L.; Liu, K.; Osłowski, S.; Perrodin, D.; Petiteau, A.; Possenti, A.; Purver, M. B.; Rosado, P. A.; Sanidas, S. A.; Smits, R.; Stappers, B.; Tiburzi, C.; Haasteren, R. van; Vecchio, A.; Verbiest, J. P. W.

doi:10.1103/PhysRevLett.115.041101

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Limits on anisotropy in the nanohertz stochastic gravitational-wave background

MPG-Autoren

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Sesana, A.
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Babak, S.
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

Brem, P.
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Rosado, P. A.
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Zitation

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.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0027-C3BA-C

Zusammenfassung

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.