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Measuring a Truncated Disk in Aquila X-1

Abstract : We present NuSTAR and Swift observations of the neutron star Aquila X-1 during the peak of its 2014 July outburst. The spectrum is soft with strong evidence for a broad Fe Kα line. Modeled with a relativistically broadened reflection model, we find that the inner disk is truncated with an inner radius of 15+/- 3{R}G. The disk is likely truncated by either the boundary layer and/or a magnetic field. Associating the truncated inner disk with pressure from a magnetic field gives an upper limit of B 5+/- 2× {10}8 G. Although the radius is truncated far from the stellar surface, material is still reaching the neutron star surface as evidenced by the X-ray burst present in the NuSTAR observation.
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https://hal-insu.archives-ouvertes.fr/insu-03670540
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Submitted on : Tuesday, May 17, 2022 - 3:20:04 PM
Last modification on : Monday, July 4, 2022 - 9:45:26 AM

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Ashley L. King, John A. Tomsick, Jon M. Miller, Jérôme Chenevez, Didier Barret, et al.. Measuring a Truncated Disk in Aquila X-1. The Astrophysical Journal Letters, 2016, 819, ⟨10.3847/2041-8205/819/2/L29⟩. ⟨insu-03670540⟩

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