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Journal Articles Physical Review Letters Year : 2015

Limits on anisotropy in the nanohertz stochastic gravitational-wave background

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J. R. Gair
  • Function : Author
L. Lentati
  • Function : Author
A. Vecchio

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 and versions

insu-01265421 , version 1 (24-10-2016)

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S. R. Taylor, C. M. F. Mingarelli, J. R. Gair, A. Sesana, Gilles Theureau, et al.. Limits on anisotropy in the nanohertz stochastic gravitational-wave background. Physical Review Letters, 2015, 115 (4), pp.041101. ⟨10.1103/PhysRevLett.115.041101⟩. ⟨insu-01265421⟩
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