MEASURING A TRUNCATED DISK IN AQUILA X-1
Author(s)King, Ashley L.; Tomsick, John A.; Miller, Jon M.; Chenevez, Jérôme; Barret, Didier; Boggs, Steven E.; Chakrabarty, Deepto; Christensen, Finn E.; Craig, William W.; Fürst, Felix; Hailey, Charles J.; Harrison, Fiona A.; Parker, Michael L.; Stern, Daniel; Romano, Patrizia; Walton, Dominic J.; Zhang, William W.; ... Show more Show less
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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 ± 3R[subscript 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 ± x 2 x 10[superscript 8]. 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.
DepartmentKavli Institute for Astrophysics and Space Research; Massachusetts Institute of Technology. Department of Physics
Astrophysical Journal. Letters
King, Ashley L., John A. Tomsick, Jon M. Miller, Jérôme Chenevez, Didier Barret, Steven E. Boggs, Deepto Chakrabarty, et al. “MEASURING A TRUNCATED DISK IN AQUILA X-1.” The Astrophysical Journal 819, no. 2 (March 7, 2016): L29. © 2016 The American Astronomical Society
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