Mapping incoherent gravitational wave backgrounds

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Title: Mapping incoherent gravitational wave backgrounds
Authors: Renzini, AI
Contaldi, CR
Item Type: Journal Article
Abstract: Given the recent detection of gravitational waves from individual sources, it is almost a certainty that some form of background of gravitational waves will be detected in future. The most promising candidate for such a detection is backgrounds made up of incoherent superposition of the signal of unresolved astrophysical, or backgrounds sourced by earlier cosmological events. Such backgrounds will also contain anisotropies about an average value. The information contained in the background level and any anisotropies will be extremely valuable as an astrophysical and cosmological probe. As such, the ability to reconstruct sky maps of the signal will become important as the sensitivity increases. We build and test a pixel-based, maximum-likelihood gravitational wave background (GWB) map-maker that uses the cross-correlation of sets of generalized baselines as input. The resulting maps are a representation of the GWB power, or strain ‘intensity’ on the sky. We test the algorithm by reconstructing known input maps with different baseline configurations. We also apply the map-maker to a subset of the Advanced Laser Interferometer Gravitational Wave observatory data.
Issue Date: 31-Dec-2018
Date of Acceptance: 13-Sep-2018
ISSN: 0035-8711
Publisher: Oxford University Press (OUP)
Start Page: 4650
End Page: 4661
Journal / Book Title: Monthly Notices of the Royal Astronomical Society
Volume: 481
Issue: 4
Copyright Statement: © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Keywords: astro-ph.IM
0201 Astronomical And Space Sciences
Astronomy & Astrophysics
Publication Status: Published
Open Access location:
Online Publication Date: 2018-09-18
Appears in Collections:Physics
Theoretical Physics
Faculty of Natural Sciences

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