Hierarchical follow-up of subthreshold candidates of an all-sky Einstein@Home search for continuous gravitational waves on LIGO sixth science run data

Papa, Maria Alessandra, Eggenstein, Heinz-Bernd, Walsh, Sinéad, Di Palma, Irene, Allen, Bruce, Astone, Pia, Bock, Oliver, Creighton, Teviet D., Keitel, David, Machenschalk, Bernd, Prix, Reinhard, Siemens, Xavier, Singh, Avneet, Zhu, Sylvia J. and Schutz, Bernard F. ORCID: https://orcid.org/0000-0001-9487-6983 2016. Hierarchical follow-up of subthreshold candidates of an all-sky Einstein@Home search for continuous gravitational waves on LIGO sixth science run data. Physical Review D 94 (12) , 122006. 10.1103/PhysRevD.94.122006

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Abstract

We report results of an all-sky search for periodic gravitational waves with frequency between 50 and 510 Hz from isolated compact objects, e.g., neutron stars. A new hierarchical multistage approach is taken, supported by the computing power of the Einstein@Home project, allowing us to probe more deeply than ever before. 16 million subthreshold candidates from the initial search [LIGO Scientific and Virgo Collaborations, Phys. Rev. D 94, 102002 (2016)] are followed up in four stages. None of those candidates is consistent with an isolated gravitational wave emitter, and 90% confidence level upper limits are placed on the amplitudes of continuous waves from the target population. Between 170.5 and 171 Hz, we set the most constraining 90% confidence upper limit on the strain amplitude h0 at 4.3×10−25, while at the high end of our frequency range, we achieve an upper limit of 7.6×10−25. These are the most constraining all-sky upper limits to date and constrain the ellipticity of rotating compact objects emitting at 300 Hz at a distance D to less than 6×10−7 [ D 100 pc ].

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Additional Information:	Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License
Publisher:	American Physical Society
ISSN:	2470-0010
Funders:	STFC
Date of First Compliant Deposit:	7 June 2017
Date of Acceptance:	1 December 2016
Last Modified:	05 May 2023 03:54
URI:	https://orca.cardiff.ac.uk/id/eprint/101236

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