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.
Autori interni: | ||
Autori: | 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;A. Alemic;B. Allen;A. Allocca;D. Amariutei;S. B. Anderson;W. G. Anderson;K. Arai;M. C. Araya;C. Arceneaux;J. S. Areeda;G. Ashton;S. Ast;S. M. Aston;P. Astone;P. Aufmuth;C. Aulbert;B. E. Aylott;S. Babak;P. T. Baker;F. Baldaccini;G. Ballardin;S. W. Ballmer;J. C. Barayoga;M. Barbet;S. Barclay;B. C. Barish;D. Barker;F. Barone;B. Barr;L. Barsotti;M. Barsuglia;J. Bartlett;M. A. Barton;I. Bartos;R. Bassiri;A. Basti;J. C. Batch;Th. S. Bauer;C. Baune;V. Bavigadda;B. Behnke;M. Bejger;C. Belczynski;A. S. Bell;C. Bell;M. Benacquista;J. Bergman;G. Bergmann;C. P. L. Berry;D. Bersanetti;A. Bertolini;J. Betzwieser;S. Bhagwat;R. Bhandare;I. A. Bilenko;G. Billingsley;J. Birch;S. Biscans;M. Bitossi;C. Biwer;M. A. Bizouard;J. K. Blackburn;L. Blackburn;C. D. Blair;D. Blair;S. 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Titolo: | Narrow-band search of continuous gravitational-wave signals from Crab and Vela pulsars in Virgo VSR4 data | |
Anno del prodotto: | 2015 | |
Digital Object Identifier (DOI): | 10.1103/PhysRevD.91.022004 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |