A relativistically broadened iron line from an Accreting Millisecond Pulsar

Rosario Iaria, Tiziana Di Salvo, Antonino D'Ai', Riggio, Burderi, Menna, Papitto

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Abstract

The capabilities of XMM-Newton have been fully exploited to detect a broadened iron Kα emission line from the 2.5 ms Accreting Millisecond Pulsar, SAX J1808.4-3658. The energy of the transition is compatible with fluorescence from neutral/lowly ionized iron. The observed large width (FWHM more than 1 keV) can be explained through Doppler and relativistic broadening from the inner rings of an accretion disc close to the NS. From a fit of the line shape with a diskline model we obtain an estimate of the inner disc radius of 18.0-5.6+7.6km for a 1.4 M⊙ neutron star. The disc is therefore truncated inside the corotation radius (31 km for SAX J1808.4-3658), in agreement with the observation of coherent pulsations. From our estimate of the inner disc radius, we infer that the magnetic field of the neutron star is in the range 1-5×108G. © 2010 American Institute of Physics.
Lingua originaleEnglish
Titolo della pubblicazione ospiteX-RAY ASTRONOMY-2009: PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES
Pagine77-80
Numero di pagine4
Stato di pubblicazionePublished - 2010

Serie di pubblicazioni

NomeAIP CONFERENCE PROCEEDINGS

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Iaria, R., Di Salvo, T., D'Ai', A., Riggio, Burderi, Menna, & Papitto (2010). A relativistically broadened iron line from an Accreting Millisecond Pulsar. In X-RAY ASTRONOMY-2009: PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES (pagg. 77-80). (AIP CONFERENCE PROCEEDINGS).