Upper limit map of a background of gravitational waves

Abbott, B. and Cantley, C.A. and Lockerbie, N.A. and Tokmakov, K. V., LIGO Scientific Collaboration (2007) Upper limit map of a background of gravitational waves. Physical Review D: Particles and Fields, 76 (8). ISSN 0556-2821

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      Abstract

      We searched for an anisotropic background of gravitational waves using data from the LIGO S4 science run and a method that is optimized for point sources. This is appropriate if, for example, the gravitational wave background is dominated by a small number of distinct astrophysical sources. No signal was seen. Upper limit maps were produced assuming two different power laws for the source strain power spectrum. For an f-3 power law and using the 50 Hz to 1.8 kHz band the upper limits on the source strain power spectrum vary between 1.2×10-48 Hz-1 (100 Hz/f)3 and 1.2×10-47 Hz-1 (100 Hz/f)3, depending on the position in the sky. Similarly, in the case of constant strain power spectrum, the upper limits vary between 8.5×10-49 Hz-1 and 6.1×10-48 Hz-1. As a side product a limit on an isotropic background of gravitational waves was also obtained. All limits are at the 90% confidence level. Finally, as an application, we focused on the direction of Sco-X1, the brightest low-mass x-ray binary. We compare the upper limit on strain amplitude obtained by this method to expectations based on the x-ray flux from Sco-X1.

      Author(s):Abbott, B., Cantley, C.A., Lockerbie, N.A. ORCID logoORCID: https://orcid.org/0000-0002-1678-3260 and Tokmakov, K. V. ORCID logoORCID: https://orcid.org/0000-0002-2808-6593
      Item type:Article
      ID code:6478
      Notes:B. Abbott et al. (LIGO Scientific Collaboration) Phys. Rev. D 76, 082003. ©2007 American Physical Society
      Keywords:x-ray, isotropic background, gravitational waves, strain amplitude, anisotropic background, astrophysics, Optics. Light, Astronomy, Physics, Physics and Astronomy (miscellaneous)
      Subjects:Science > Physics > Optics. Light
      Science > Astronomy
      Science > Physics
      Department:Faculty of Science > Physics
      Faculty of Engineering
      Depositing user: Miss Darcy Spiller
      Date deposited:08 Jul 2008
      Last modified:23 Jan 2020 05:29
      URI:https://strathprints.strath.ac.uk/id/eprint/6478
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