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

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.
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https://hal-insu.archives-ouvertes.fr/insu-03670226
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Tuesday, May 17, 2022 - 11:57:15 AM
Last modification on : Monday, July 4, 2022 - 8:42:42 AM

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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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