NuSTAR and XMM-Newton Observations of the Neutron Star X-Ray Binary 1RXS J180408.9-34205
Journal
Date Issued
2016
Author(s)
Ludlam, R. M.
•
Miller, J. M.
•
Cackett, E. M.
•
Fabian, A. C.
•
•
Parker, M. L.
•
Tomsick, J. A.
•
Barret, D.
•
•
Rana, V.
•
Harrison, F. A.
Abstract
We report on observations of the neutron star (NS) residing in the low-mass X-ray binary 1RXS J180408.9-34205 taken 2015 March by NuSTAR and XMM-Newton while the source was in the hard spectral state. We find multiple reflection features (Fe {{{K}}}α detected with NuSTAR; N vii, O vii, and O viii detected in the RGS) from different ionization zones. Through joint fits using the self-consistent relativistic reflection model relxill, we determine the inner radius to be ≤11.1 R g . For a 1.4 {M}☉ NS with a spin of {a}\ast =0, this is an inner disk radius of ≤slant 22.2 km. We find the inclination of the system to be between 18° and 29°. If the disk is truncated at a radius greater than the NS radius, it could be truncated by a boundary layer on the NS surface. It is also possible that the disk is truncated at the magnetospheric radius; conservative estimates would then imply B≤slant (0.3{--}1.0)× {10}9 G at the magnetic poles, though coherent pulsations have not been detected and the source is not identified as a pulsar.
Volume
824
Issue
1
Start page
37
Issn Identifier
0004-637X
Ads BibCode
2016ApJ...824...37L
Rights
open.access
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