Year: 2019
Type: article
Abstract: 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 ${f}_{0}$. The data are integrated assuming a set of fixed power-law spectra for the signal. The maps provide upper limits on the amplitude of the GWB density ${\mathrm{\ensuremath{\Omega}}}_{\mathrm{GW}}({f}_{0})$ and any anisotropy around the background. We find 95% confidence upper limits of ${\mathrm{\ensuremath{\Omega}}}_{\mathrm{GW}}<4.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$ at ${f}_{0}=50\text{ }\text{ }\mathrm{Hz}$ with similar constraints on a dipole modulation for the inspiral-dominated stochastic background case.
Source: Physical Review Letters
Authors: Arianna I. Renzini, Carlo R. Contaldi
Institution: Imperial College London
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2902822982