2015MNRAS.454.3366Z

We present the results from the analysis of the broad-band X-ray spectra of five anomalous X-ray pulsars (AXPs) and soft γ-ray repeaters (SGRs). We fit their Suzaku and INTEGRAL spectra with models appropriate for the X-ray emission from the accretion flow on to a pulsar. We find that their X-ray spectra can be well described with this model. In particular, we find that (a) the radius of the accretion column is ∼ 150-350 m resulting in a transverse optical depth of ∼ 1, (b) the vertical Thompson optical depth is ~50-400, and (c) their luminosity translates in accretion rates ~ 10¹⁵g/s. These results are in good agreement with the predictions from the fall-back disc model, providing further support in the interpretation of AXPs and SGRs as accreting pulsars.