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

  • J. Aasi
  • , B. P. Abbott
  • , R. Abbott
  • , T. Abbott
  • , M. R. Abernathy
  • , F. Acernese
  • , K. Ackley
  • , C. Adams
  • , T. Adams
  • , T. Adams
  • , P. Addesso
  • , R. X. Adhikari
  • , V. Adya
  • , C. Affeldt
  • , M. Agathos
  • , K. Agatsuma
  • , N. Aggarwal
  • , O. D. Aguiar
  • , A. Ain
  • , P. Ajith
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Research output: Contribution to journalArticlepeer-review

43 Scopus citations

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.

Original languageEnglish
Article number022004
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number2
DOIs
StatePublished - 21 Jan 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society.

Funding

FundersFunder number
National Science Foundation1404121, 1307429, 1207010, 1308527, 1204371, 1205882, 1505779, 1307020, 1067985, 1305864, 1307401, 1307423, 1404139, 1404569
Science and Technology Facilities CouncilPPA/G/S/2002/00652, ST/K005014/1, ST/J001163/1, Gravitational Waves, ST/K000845/1, ST/I006285/1, ST/L003465/1, ST/M006735/1, ST/I006269/1, ST/L000938/1, ST/L000946/1, ST/L000962/1, ST/I006277/1, ST/J00166X/1, ST/L000911/1

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