2015/08/19 by A. Zezas, J. Trümper, J. E. Trümper +1
Earth and Planetary Sciences · Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #High-pressure geophysics and materials #Luminosity #Optics #Physics #Pulsar #Pulsars and Gravitational Waves Research #RADIUS #Spectral line #X-ray #X-ray pulsar #astro-ph.HE
paper · pdf · doi:10.1093/mnras/stv1918
Accepted for publication in MNRAS, 10 pages, 2 figures
arxiv created 2015/08/19 · openalex publication_date 2015/10/20 · arxiv updated 2015/10/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 ≈ 1015 g s− 1. 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.