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http://hdl.handle.net/20.500.12386/26996
Titolo: | Study of the accretion torque during the 2014 outburst of the X-ray pulsar GRO J1744-28 | Autori: | Sanna, A. Riggio, A. Burderi, L. Pintore, Fabio Di Salvo, T. D'AI', ANTONINO Bozzo, E. Esposito, P. Segreto, A. Scarano, F. Iaria, R. Gambino, A. F. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 469 | Fascicolo: | 1 | Da pagina:: | 2 | Abstract: | We present the spectral and timing analysis of the X-ray pulsar GRO J1744-28 during its 2014 outburst using data collected with the X-ray satellites Swift, INTEGRAL, Chandra, and XMM-Newton. We derived, by phase-connected timing analysis of the observed pulses, an updated set of the source ephemeris. We were also able to investigate the spin-up of the X-ray pulsar as a consequence of the accretion torque during the outburst. Relating the spin-up rate and the mass accretion rate as \dot{ν }∝ \dot{M}^{β }, we fitted the pulse phase delays obtaining a value of β = 0.96(3). Combining the results from the source spin-up frequency derivative and the flux estimation, we constrained the source distance to be between 3.4 and 4.1 kpc, assuming a disc viscous parameter α to be in the range of 0.1-1. Finally, we investigated the presence of a possible spin-down torque by adding a quadratic component to the pulse phase delay model. The marginal statistical improvement of the updated model does not allow us to firmly confirm the presence of this component. | URI: | http://hdl.handle.net/20.500.12386/26996 | URL: | https://academic.oup.com/mnras/article-abstract/469/1/2/3072189?redirectedFrom=fulltext | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx635 | Bibcode ADS: | 2017MNRAS.469....2S | Fulltext: | open |
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