2018/11/30 by Arianna I. Renzini, Carlo R. Contaldi · 1 citation
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1103/physrevlett.122.081102
published as Phys. Rev. Lett. 122, 081102 (2019) · 5 pages, 3 figures, 3 tables
arxiv created 2019/01/23 · arxiv updated 2019/03/06
We integrate the publicly available O1 LIGO time-domain data to obtain maximum-likelihood constraints on the Gravitational Wave Background (GWB) arising from stochastic, persistent signals. Our method produces sky-maps of the strain intensity I as a function of direction on the sky at a reference frequency f0. The data is integrated assuming a set of fixed power-law spectra for the signal. The maps provide upper limits on the amplitude of the GWB density Ω\rm GW(f0) and any anisotropy around the background. We find 95% confidence upper limits of Ω\rm GW < 4.8× 10-7 at f0=50 Hz with similar constraints on a dipole modulation for the inspiral-dominated stochastic background case.