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Directional limits on persistent gravitational waves from Advanced LIGO's first observing run
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arxiv 1612.02030 v4 pith:IULYFMAH submitted 2016-12-06 gr-qc astro-ph.COastro-ph.HEastro-ph.IM
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abstract
We employ gravitational-wave radiometry to map the gravitational waves stochastic background expected from a variety of contributing mechanisms and test the assumption of isotropy using data from Advanced LIGO's first observing run. We also search for persistent gravitational waves from point sources with only minimal assumptions over the 20 - 1726 Hz frequency band. Finding no evidence of gravitational waves from either point sources or a stochastic background, we set limits at 90% confidence. For broadband point sources, we report upper limits on the gravitational wave energy flux per unit frequency in the range $F_{\alpha,\Theta}(f) < (0.1 - 56) \times 10^{-8}$ erg cm$^{-2}$ s$^{-1}$ Hz$^{-1}$ (f/25 Hz)$^{\alpha-1}$ depending on the sky location $\Theta$ and the spectral power index $\alpha$. For extended sources, we report upper limits on the fractional gravitational wave energy density required to close the Universe of $\Omega(f,\Theta) < (0.39-7.6) \times 10^{-8}$ sr$^{-1}$ (f/25 Hz)$^\alpha$ depending on $\Theta$ and $\alpha$. Directed searches for narrowband gravitational waves from astrophysically interesting objects (Scorpius X-1, Supernova 1987 A, and the Galactic Center) yield median frequency-dependent limits on strain amplitude of $h_0 <$ (6.7, 5.5, and 7.0) $\times 10^{-25}$ respectively, at the most sensitive detector frequencies between 130 - 175 Hz. This represents a mean improvement of a factor of 2 across the band compared to previous searches of this kind for these sky locations, considering the different quantities of strain constrained in each case.
Forward citations
Cited by 4 Pith papers
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gr-qc 2025-10 conditional novelty 6.0 of 10
An 8.3-year LIGO–Virgo–KAGRA search for persistent, direction-dependent gravitational waves finds no signal and yields the most restrictive upper limits to date on anisotropic backgrounds and targeted sources.
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All symmetry groups of pp-waves in teleparallel gravity
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Spotlight searches for continuous gravitational waves triggered on radiometer candidates in LIGO O4a data
gr-qc 2026-08 accept novelty 5.0 of 10
No continuous gravitational-wave signal was found in any of the 562 radiometer-triggered candidates after vetoes and an O4b follow-up; the search reaches 95% detection efficiency for strains around 0.63 to 6.3 times 10^-25.
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