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1 Astrophysics Science Division, NASA Goddard Space Flight Center 2 USN - Unité Scientifique de la Station de Nançay 3 LPC2E - Laboratoire de Physique et Chimie de l-Environnement et de l-Espace 4 IRAP - Institut de recherche en astrophysique et planétologie 5 CENBG - Centre d-Etudes Nucléaires de Bordeaux Gradignan

Abstract : We report the results of a 16-month monitoring campaign using the Swift satellite of PSR 0 ¯ 540, a young pulsar in the Large Magellanic Cloud. Phase connection was maintained throughout the campaign so that a reliable ephemeris could be determined, and the length of the campaign is adequate to accurately determine the spin frequency ν and its first and second derivatives. The braking index n is 0.031 ± 0.013 90% confidence, a value much lower than previously reported for 0 ¯ 540 and almost all other young pulsars. We use data from the extensive monitoring campaign with RXTE to show that timing noise is unlikely to significantly affect the measurement. This is the first measurement of the braking index in the pulsar-s recently discovered high spin-down state. We discuss possible mechanisms for producing the low braking index.

Keywords : pulsars: individual PSR B0540–69

Autor: F Marshall - Lucas Guillemot - A Harding - Pierre Martin - D Smith -

Fuente: https://hal.archives-ouvertes.fr/


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