Einstein@Home search for continuous gravitational waves from Cassiopeia A
Abstract
We report the results of a directed search for continuous gravitationalwave 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 come 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 gravitationalwave emission from Cas A, which beat the indirect agebased upper limit across the entire search range. At 170 Hz (the most sensitive frequency range), we set 90% confidence upper limits on the gravitationalwave amplitude h_{0} of ∼2.9 ×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 gravitationalwave frequencies greater than 300 Hz we can exclude an ellipticity of ≳10^{5}.
 Publication:

Physical Review D
 Pub Date:
 October 2016
 DOI:
 10.1103/PhysRevD.94.082008
 arXiv:
 arXiv:1608.07589
 Bibcode:
 2016PhRvD..94h2008Z
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena;
 Astrophysics  Instrumentation and Methods for Astrophysics
 EPrint:
 29 pages, 7 figures, 3 tables