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|a King, Ashley L.
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|a Massachusetts Institute of Technology. Department of Physics
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Chakrabarty, Deepto
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|a Tomsick, John A.
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|a Miller, Jon M.
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|a Chenevez, Jérôme
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|a Barret, Didier
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|a Boggs, Steven E.
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|a Chakrabarty, Deepto
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|a Christensen, Finn E.
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|a Craig, William W.
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|a Fürst, Felix
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|a Hailey, Charles J.
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|a Harrison, Fiona A.
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|a Parker, Michael L.
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|a Stern, Daniel
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|a Romano, Patrizia
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|a Walton, Dominic J.
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|a Zhang, William W.
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|a MEASURING A TRUNCATED DISK IN AQUILA X-1
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|b IOP Publishing,
|c 2017-04-21T18:59:22Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/108359
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|a 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.
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|a Article
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|t Astrophysical Journal. Letters
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