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Related Experiment Video

Updated: Jul 11, 2026

Bringing the Visible Universe into Focus with Robo-AO
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Directional Limits on Persistent Gravitational Waves from Advanced LIGO's First Observing Run.

B P Abbott1, R Abbott1, T D Abbott2

  • 1LIGO, California Institute of Technology, Pasadena, California 91125, USA.

Physical Review Letters
|April 8, 2017
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This study used gravitational-wave radiometry with Advanced Laser Interferometer Gravitational-Wave Observatory (aLIGO) data to search for gravitational waves. No evidence was found for a stochastic background or point sources, leading to new upper limits.

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Area of Science:

  • Astronomy and Astrophysics
  • Cosmology
  • Gravitational Wave Physics

Background:

  • The stochastic gravitational wave background is a predicted signal from various cosmic sources.
  • Isotropy of this background is a key assumption in many cosmological models.
  • Point sources can also emit persistent gravitational waves detectable by instruments like aLIGO.

Purpose of the Study:

  • To map the stochastic gravitational wave background using gravitational-wave radiometry.
  • To test the isotropy of the gravitational wave background.
  • To search for persistent gravitational waves from point sources with minimal assumptions.

Main Methods:

  • Utilized data from the Advanced Laser Interferometer Gravitational Wave Observatory's (aLIGO) first observing run.
  • Employed gravitational-wave radiometry techniques for mapping and isotropy testing.
  • Performed directed searches for narrowband gravitational waves from specific astrophysical objects.

Main Results:

  • No evidence for a stochastic gravitational wave background was detected.
  • No evidence for persistent gravitational waves from point sources was found.
  • Established new 90% confidence upper limits on gravitational wave flux and energy density for various source types and sky locations.

Conclusions:

  • The study sets stringent upper limits on gravitational wave signals, constraining astrophysical models.
  • The results improve upon previous searches for gravitational waves from specific sources like Scorpius X-1 and Supernova 1987A.
  • The lack of detected signals provides valuable information for understanding the universe's gravitational wave content.