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Braking index jumps in young pulsars

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Autor(es):
Horvath, J. E.
Número total de Autores: 1
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 484, n. 2, p. 1983-1987, APR 2019.
Citações Web of Science: 0
Resumo

The departure of all measured pulsar braking indexes from the `canonical' dipole value 3 has been attributed to several causes in the past. Careful monitoring of the Crab pulsar has revealed permanent changes in the spin-down rate that are most likely the accumulation of small jumps in the angle a between the magnetic and spin axis. Recently, a large permanent change in the braking index of the in the `Crab twin' pulsar B0540-69 has been reported, and an analogous phenomenon seen in the high-field pulsar PSR 1846-0258 has been seen following a glitch, while another similar event (in PSR J119-6127) needs to be confirmed. We argue in this work that a common physical origin of all these observations can be attributed to the counter-alignment of the axis without serious violations of the observed features and with very modest inferred values of the hypothesized jump in the alpha angle. In addition, detected increases of the X-ray luminosities after the events are an additional ingredient for this interpretation. We argue that a component of a time-dependent torque has been identified, being an important ingredient towards a full solution of observed pulsar timing behaviour which is in search of a consistent modelling. (AU)

Processo FAPESP: 13/26258-4 - Matéria superdensa no universo
Beneficiário:Manuel Máximo Bastos Malheiro de Oliveira
Linha de fomento: Auxílio à Pesquisa - Temático