42 articles – 130 Notices  [english version]
 HAL : in2p3-00624014, version 1
 arXiv : 1104.2712
 Code Bibliographique ADS : 2011ApJ...737...93A
 Astrophysical Journal 737 (2011) 93
 Beating the spin-down limit on gravitational wave emission from the Vela pulsar
 VIRGO Collaboration(s)
 (2011)
 We present direct upper limits on continuous gravitational wave emission from the Vela pulsar using data from the Virgo detector's second science run. These upper limits have been obtained using three independent methods that assume the gravitational wave emission follows the radio timing. Two of the methods produce frequentist upper limits for an assumed known orientation of the star's spin axis and value of the wave polarization angle of, respectively, $1.9\ee{-24}$ and $2.2\ee{-24}$, with 95% confidence. The third method, under the same hypothesis, produces a Bayesian upper limit of $2.1\ee{-24}$, with 95% degree of belief. These limits are below the indirect {\it spin-down limit} of $3.3\ee{-24}$ for the Vela pulsar, defined by the energy loss rate inferred from observed decrease in Vela's spin frequency, and correspond to a limit on the star ellipticity of $\sim 10^{-3}$. Slightly less stringent results, but still well below the spin-down limit, are obtained assuming the star's spin axis inclination and the wave polarization angles are unknown.
 équipe(s) de recherche : APC - Cosmologie et GravitationAPC - ADAMIS
 Thème(s) : Physique/Astrophysique/Phénomènes cosmiques de haute energiePlanète et Univers/Astrophysique/Phénomènes cosmiques de haute energiePhysique/Relativité Générale et Cosmologie Quantique
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1104.2712
 in2p3-00624014, version 1 http://hal.in2p3.fr/in2p3-00624014 oai:hal.in2p3.fr:in2p3-00624014 Contributeur : Nicole Berger <> Soumis le : Jeudi 15 Septembre 2011, 15:40:49 Dernière modification le : Vendredi 20 Avril 2012, 16:53:33