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Journal Articles The Astrophysical Journal Letters Year : 2016

Measuring a Truncated Disk in Aquila X-1

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Ashley L. King
  • Function : Author
John A. Tomsick
  • Function : Author
Jon M. Miller
  • Function : Author
Jérôme Chenevez
  • Function : Author
Steven E. Boggs
  • Function : Author
Deepto Chakrabarty
  • Function : Author
Finn E. Christensen
  • Function : Author
William W. Craig
  • Function : Author
Felix Fürst
  • Function : Author
Charles J. Hailey
  • Function : Author
Fiona A. Harrison
  • Function : Author
Michael L. Parker
  • Function : Author
Daniel Stern
  • Function : Author
Patrizia Romano
  • Function : Author
Dominic J. Walton
  • Function : Author
William W. Zhang
  • Function : Author

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.

Dates and versions

insu-03670540 , version 1 (17-05-2022)

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Cite

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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