Gravitational wave background sky maps from advanced LIGO O1 data

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Title: Gravitational wave background sky maps from advanced LIGO O1 data
Authors: Renzini, AI
Contaldi, CR
Item Type: Working Paper
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 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 ΩGW(f0) and any anisotropy around the background. We find 95\% confidence upper limits of ΩGW<4.8×10−7 at f0=50 Hz with similar constraints on a dipole modulation for the inspiral-dominated stochastic background case.
Issue Date: 23-Jan-2019
Publisher: arXiv
Copyright Statement: © 2018 The Author(s).
Sponsor/Funder: Science and Technology Facilities Council
Science and Technology Facilities Council (STFC)
Funder's Grant Number: ST-N000838
Keywords: astro-ph.CO
Publication Status: Published
Appears in Collections:Physics
Theoretical Physics
Faculty of Natural Sciences

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