논문
Application of a Hough search for continuous gravitational waves on data from the fifth LIGO science run
- 저자LIGO Scientific Collaboration, Virgo Collaboration and NINJA Collaboration (Sang Hoon Oh, John J. Oh, Edwin J. Son)
- 학술지Classical and quantum gravity 31(8), 085014
- 등재유형
- 게재일자(2014)
We report on an all--sky search for periodic gravitational waves in the frequency range $\mathrm{50-1000\,Hz}$ with the first derivative of frequency in the range $-8.9 \times 10^{-10}$~Hz/s to zero in two years of data collected during LIGO's fifth science run. Our results employ a Hough transform technique, introducing a $\chi^2$ test and analysis of coincidences between the signal levels in years 1 and 2 of observations that offers a significant improvement in the product of strain sensitivity with compute cycles per data sample compared to previously published searches. Since our search yields no surviving candidates, we present results taking the form of frequency dependent, 95$\%$ confidence upper limits on the strain amplitude $h_0$. The most stringent upper limit from year 1 is $1.0\times 10^{-24}$ in the $\mathrm{158.00-158.25\,Hz}$ band. In year 2, the most stringent upper limit is $\mathrm{8.9\times10^{-25}}$ in the $\mathrm{146.50-146.75\,Hz}$ band. This improved detection pipeline, which is computationally efficient by at least two orders of magnitude better than our flagship Einstein$@$Home search, will be important for ``quick-look'' searches in the Advanced LIGO and Virgo detector era.
We report on an all--sky search for periodic gravitational waves in the frequency range $\mathrm{50-1000\,Hz}$ with the first derivative of frequency in the range $-8.9 \times 10^{-10}$~Hz/s to zero in two years of data collected during LIGO's fifth science run. Our results employ a Hough transform technique, introducing a $\chi^2$ test and analysis of coincidences between the signal levels in years 1 and 2 of observations that offers a significant improvement in the product of strain sensitivity with compute cycles per data sample compared to previously published searches. Since our search yields no surviving candidates, we present results taking the form of frequency dependent, 95$\%$ confidence upper limits on the strain amplitude $h_0$. The most stringent upper limit from year 1 is $1.0\times 10^{-24}$ in the $\mathrm{158.00-158.25\,Hz}$ band. In year 2, the most stringent upper limit is $\mathrm{8.9\times10^{-25}}$ in the $\mathrm{146.50-146.75\,Hz}$ band. This improved detection pipeline, which is computationally efficient by at least two orders of magnitude better than our flagship Einstein$@$Home search, will be important for ``quick-look'' searches in the Advanced LIGO and Virgo detector era.
