We report on an all-sky search with the LIGO detectors for periodic gravitational waves in the frequency range 50'1100 Hz and with the frequency's time derivative in the range -5Ã—10-9'0''Hz's-1. Data from the first eight months of the fifth LIGO science run (S5) have been used in this search, which is based on a semicoherent method (PowerFlux) of summing strain power. Observing no evidence of periodic gravitational radiation, we report 95% confidence-level upper limits on radiation emitted by any unknown isolated rotating neutron stars within the search range. Strain limits below 10-24 are obtained over a 200-Hz band, and the sensitivity improvement over previous searches increases the spatial volume sampled by an average factor of about 100 over the entire search band. For a neutron star with nominal equatorial ellipticity of 10-6, the search is sensitive to distances as great as 500 pc.
|Number of pages||6|
|Journal||Physical Review Letters|
|Publication status||Published - 2009|
Abbott, B. P., Abbott, R., Adhikari, R., Ajith, P., Allen, B., Allen, G., Amin, RS., Anderson, SB., Anderson, WG., Arain, MA., Araya, M., Armandula, H., Armor, P., Aso, Y., Aston, S., & Charlton, P. (2009). All-Sky LIGO Search for Periodic Gravitational Waves in the Early Fifth-Science-Run Data. Physical Review Letters, 102(11), 1-6.