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 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 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.

Renzini, A., Contaldi, C. (2019). Gravitational-Wave Background Sky Maps from Advanced LIGO O1 Data. PHYSICAL REVIEW LETTERS, 122(8) [10.1103/PhysRevLett.122.081102].

Gravitational-Wave Background Sky Maps from Advanced LIGO O1 Data

Renzini A. I.;
2019

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 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 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.
Articolo in rivista - Articolo scientifico
Gravitational effects; Maximum likelihood; Stochastic systems
English
2019
122
8
081102
none
Renzini, A., Contaldi, C. (2019). Gravitational-Wave Background Sky Maps from Advanced LIGO O1 Data. PHYSICAL REVIEW LETTERS, 122(8) [10.1103/PhysRevLett.122.081102].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/459644
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