Upper limit map of a background of gravitational waves
Collaboration
11 pages
Published in:
- Phys.Rev.D 76 (2007) 082003
e-Print:
- astro-ph/0703234 [astro-ph]
Report number:
- LIGO-P060029-00-Z
Experiments:
View in:
Citations per year
Abstract: (arXiv)
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 1.2e-48 Hz^-1 (100 Hz/f)^3 and 1.2e-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 8.5e-49 Hz^-1 and 6.1e-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 closest low-mass X-ray binary. We compare the upper limit on strain amplitude obtained by this method to expectations based on the X-ray luminosity of Sco-X1.Note:
- 11 pages, 9 figures, 2 tables
- 07.05.Kf
- 02.50.Ey
- 04.80.Nn
- 04.30.Db
- gravitational radiation: particle source
- background: stochastic
- upper limit
- power spectrum
- interpretation of experiments: LIGO
- numerical calculations
References(6)
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