Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data

Aasi, J., Adams, Thomas, Dooley, Katherine ORCID: https://orcid.org/0000-0002-1636-0233, Grote, Hartmut ORCID: https://orcid.org/0000-0002-0797-3943, Hannam, Mark ORCID: https://orcid.org/0000-0001-5571-325X, Hopkins, Paul ORCID: https://orcid.org/0000-0003-1535-3848, Ohme, Frank, Pannarale Greco, Francesco ORCID: https://orcid.org/0000-0002-7537-3210, Sathyaprakash, Bangalore Suryanarayana ORCID: https://orcid.org/0000-0003-3845-7586, Schutz, Bernard Frederick ORCID: https://orcid.org/0000-0001-9487-6983, Sutton, Patrick J. ORCID: https://orcid.org/0000-0003-1614-3922, Williamson, Andrew R. ORCID: https://orcid.org/0000-0002-7627-8688, LIGO Scientific Collaboration and Virgo Collaboration 2015. Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data. Physical Review D 91 , 022004. 10.1103/PhysRevD.91.022004

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Abstract

In this paper we present the results of a coherent narrow-band search for continuous gravitational-wave signals from the Crab and Vela pulsars conducted on Virgo VSR4 data. In order to take into account a possible small mismatch between the gravitational-wave frequency and two times the star rotation frequency, inferred from measurement of the electromagnetic pulse rate, a range of 0.02 Hz around two times the star rotational frequency has been searched for both the pulsars. No evidence for a signal has been found and 95% confidence level upper limits have been computed assuming both that polarization parameters are completely unknown and that they are known with some uncertainty, as derived from x-ray observations of the pulsar wind torii. For Vela the upper limits are comparable to the spin-down limit, computed assuming that all the observed spin-down is due to the emission of gravitational waves. For Crab the upper limits are about a factor of 2 below the spin-down limit, and represent a significant improvement with respect to past analysis. This is the first time the spin-down limit is significantly overcome in a narrow-band search.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Additional Information:	Please follow links to article for a complete list of authors.
Publisher:	American Physical Society
ISSN:	0556-2821
Date of Acceptance:	November 2014
Last Modified:	14 May 2024 15:26
URI:	https://orca.cardiff.ac.uk/id/eprint/69689

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