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Journal Article

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

##### MPS-Authors

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##### Fulltext (public)

1608.07589.pdf

(Preprint), 998KB

PRD.94.082008.pdf

(Publisher version), 3MB

##### Supplementary Material (public)

There is no public supplementary material available

##### 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: http://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 $\gtrsim\!\!~10^{-5}$.