All-sky search for periodic gravitational waves in LIGO S5 the full data

J. Abadie, N. A. Lockerbie, K. V. Tokmakov, LIGO Scientific Collaboration, Virgo Collaboration

Research output: Contribution to journalArticle

60 Citations (Scopus)
16 Downloads (Pure)

Abstract

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.
Original languageEnglish
Article number022001
Number of pages19
JournalPhysical Review D
Volume85
Issue number2
DOIs
Publication statusPublished - 5 Jan 2012

Keywords

  • periodic gravitational waves
  • LIGO S5
  • gravitational waves
  • neutron stars

Cite this

Abadie, J., Lockerbie, N. A., Tokmakov, K. V., LIGO Scientific Collaboration, & Virgo Collaboration (2012). All-sky search for periodic gravitational waves in LIGO S5 the full data. Physical Review D, 85(2), [022001]. https://doi.org/10.1103/PhysRevD.85.022001