Abadie, J. and Abbott, B. P. and Abbott, R. and Abbott, T. D. and Lockerbie, N. A. and Tokmakov, K. V. and Collaboration, LIGO Sci and Collaboration, Virgo (2012) All-sky search for periodic gravitational waves in LIGO S5 the full data. Physical Review D, 85 (2). ISSN 1550-2368Full text not available in this repository. (Request a copy from the Strathclyde author)
We report on an all-sky search for periodic gravitational waves in the frequency band 50-800 Hz and with the frequency time derivative in the range of 0 through -6 x 10(-9) Hz/s. Such a signal could be produced by a nearby spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. After recent improvements in the search program that yielded a 10x increase in computational efficiency, we have searched in two years of data collected during LIGO's fifth science run and have obtained the most sensitive all-sky upper limits on gravitational-wave strain to date. Near 150 Hz our upper limit on worst-case linearly polarized strain amplitude h(0) is 1 x 10(-24), while at the high end of our frequency range we achieve a worst-case upper limit of 3.8 x 10(-24) for all polarizations and sky locations. These results constitute a factor of 2 improvement upon previously published data. A new detection pipeline utilizing a loosely coherent algorithm was able to follow up weaker outliers, increasing the volume of space where signals can be detected by a factor of 10, but has not revealed any gravitational-wave signals. The pipeline has been tested for robustness with respect to deviations from the model of an isolated neutron star, such as caused by a low-mass or long-period binary companion.
|Keywords:||periodic gravitational waves , LIGO S5 , gravitational waves, neutron stars, Solid state physics. Nanoscience, Nuclear and High Energy Physics|
|Subjects:||Science > Physics > Solid state physics. Nanoscience|
|Department:||Faculty of Science > Physics|
|Depositing user:||Pure Administrator|
|Date Deposited:||30 May 2012 13:39|
|Last modified:||29 Jul 2016 03:03|