2016/02/24 by Ashley L. King, John A. Tomsick, Jon M. Miller +16 · 1 citation
Physics and Astronomy · #Astrophysical Phenomena and Observations #Boundary (topology) #Boundary layer #Gamma-ray bursts and supernovae #Limit (mathematics) #Magnetic field #Neutron star #Pulsars and Gravitational Waves Research #RADIUS #Reflection (computer programming) #Star (game theory) #astro-ph.HE
paper · pdf · doi:10.3847/2041-8205/819/2/l29
ApJL Accepted, 8 pages, 4 figures
arxiv created 2016/02/24 · openalex publication_date 2016/03/07 · arxiv updated 2016/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 K α line. Modeled with a relativistically broadened reflection model, we find that the inner disk is truncated with an inner radius of . 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 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.