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Di Salvo, Tiziana
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document
Chandra spectroscopy of the X-ray spectrum of the newly discovered accreting millisecond pulsar IGR J17498-2921
Abstract
Papitto et al. (2011, ATel #3556) reported the discovery of a coherent pulsed signal from the hard X-ray transient IGR J17498-2921 (Gibaud et al. 2011, ATel #3551) at a frequency of 401 Hz, very similar to the spin frequency of the first discovered Accreting Millisecond Pulsar (AMSP) SAX J1808.4-3658. Taking advantage from the reported position of the source (ATels #3558, #3559) we propose to observe this source with Chandra/HETG in order to perform X-ray spectroscopy of the X-ray spectrum of this interesting source and to get invaluable information on the innermost emitting region. The PCA spectrum shows evidence of a strong and broad iron emission line at 6.4 keV (sigma = 0.8 keV). Chandra will be able to confirm that the line is produced at the inner accretion disc. In this case, fitting with self-consistent reflection models will give important information on the position of the magnetospheric radius and on the neutron star magnetic field....