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#### Einstein@Home search for continuous gravitational waves from Cassiopeia A

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1608.07589.pdf

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PRD.94.082008.pdf

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##### Citation

Zhu, S. J., Papa, M. A., Eggenstein, H.-B., Prix, R., Wette, K., Allen, B., et al. (2016).
Einstein@Home search for continuous gravitational waves from Cassiopeia A.* Physical Review D,*
*94*: 082008. doi:10.1103/PhysRevD.94.082008.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-5D00-C

##### Abstract

We report the results of a directed search for continuous gravitational-wave

emission in a broad frequency range (between 50 and 1000 Hz) from the central

compact object of the supernova remnant Cassiopeia A (Cas A). The data comes

from the sixth science run of LIGO and the search is performed on the volunteer

distributed computing network Einstein@Home. We find no significant signal

candidate, and set the most constraining upper limits to date on the

gravitational-wave emission from Cas A, which beat the indirect age-based upper

limit across the entire search range. At around 170 Hz (the most sensitive

frequency range), we set 90% confidence upper limits on the gravitational wave

amplitude $h_0$ of $\sim\!\!~2.9\times 10^{-25}$, roughly twice as constraining

as the upper limits from previous searches on Cas A. The upper limits can also

be expressed as constraints on the ellipticity of Cas A; with a few reasonable

assumptions, we show that at gravitational-wave frequencies greater than

300~Hz, we can exclude an ellipticity of $\gtrsim\!\!~10^{-5}$.

emission in a broad frequency range (between 50 and 1000 Hz) from the central

compact object of the supernova remnant Cassiopeia A (Cas A). The data comes

from the sixth science run of LIGO and the search is performed on the volunteer

distributed computing network Einstein@Home. We find no significant signal

candidate, and set the most constraining upper limits to date on the

gravitational-wave emission from Cas A, which beat the indirect age-based upper

limit across the entire search range. At around 170 Hz (the most sensitive

frequency range), we set 90% confidence upper limits on the gravitational wave

amplitude $h_0$ of $\sim\!\!~2.9\times 10^{-25}$, roughly twice as constraining

as the upper limits from previous searches on Cas A. The upper limits can also

be expressed as constraints on the ellipticity of Cas A; with a few reasonable

assumptions, we show that at gravitational-wave frequencies greater than

300~Hz, we can exclude an ellipticity of $\gtrsim\!\!~10^{-5}$.