MEASURING A TRUNCATED DISK IN AQUILA X-1
Name
King-2016-MEASURING A TRUNCATE.pdf
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1.07 MB
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Checksum (MD5)
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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
Date Issued
March 2016
Journal
Astrophysical Journal. Letters
Publisher
IOP Publishing
Citation
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
Version
Final published version
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 ± 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/2041-8205/819/2/l29
