NuSTAR and XMM-Newton Observations of the Neutron Star X-Ray Binary 1RXS J180408.9-34205 - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Year : 2016

NuSTAR and XMM-Newton Observations of the Neutron Star X-Ray Binary 1RXS J180408.9-34205

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1
R. M. Ludlam
  • Function : Author
J. M. Miller
  • Function : Author
E. M. Cackett
  • Function : Author
A. C. Fabian
  • Function : Author
M. Bachetti
  • Function : Author
M. L. Parker
  • Function : Author
J. A. Tomsick
  • Function : Author
L. Natalucci
  • Function : Author
V. Rana
  • Function : Author
F. A. Harrison
  • Function : Author

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.

Dates and versions

insu-03670226 , version 1 (17-05-2022)

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Cite

R. M. Ludlam, J. M. Miller, E. M. Cackett, A. C. Fabian, M. Bachetti, et al.. NuSTAR and XMM-Newton Observations of the Neutron Star X-Ray Binary 1RXS J180408.9-34205. The Astrophysical Journal, 2016, 824, ⟨10.3847/0004-637X/824/1/37⟩. ⟨insu-03670226⟩
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