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NuSTAR and XMM-Newton observations of 1E1743.1-2843: indications of a neutron star LMXB nature of the compact object | | Simone Lotti
; Lorenzo Natalucci
; Kaya Mori
; Frederick K. Baganoff
; Steven E. Boggs
; Finn E. Christensen
; William W. Craig
; Charles J. Hailey
; Fiona A. Harrison
; Jaesub Hong
; Roman A. Krivonos
; Farid Rahoui
; Daniel Stern
; John A. Tomsick
; Shuo Zhang
; William W. Zhang
; | | Date: |
8 Mar 2016 | | Abstract: | We report on the results of NuSTAR and XMM-Newton observations of the
persistent X-ray source 1E1743.1-2843, located in the Galactic Center region.
The source was observed between September and October 2012 by NuSTAR and
XMM-Newton, providing almost simultaneous observations in the hard and soft
X-ray bands. The high X-ray luminosity points to the presence of an accreting
compact object. We analyze the possibilities of this accreting compact object
being either a neutron star (NS) or a black hole, and conclude that the joint
XMM-Newton and NuSTAR spectrum from 0.3 to 40 $mathrm{keV}$ fits to a black
body spectrum with $kTsim1.8~mathrm{keV}$ emitted from a hot spot or an
equatorial strip on a neutron star surface. This spectrum is thermally
Comptonized by electrons with $kT_{e}sim4.6~mathrm{keV}$. Accepting this
neutron star hypothesis, we probe the Low Mass (LMXB) or High Mass (HMXB) X-ray
Binary nature of the source. While the lack of Type-I bursts can be explained
in the LMXB scenario, the absence of pulsations in the 2 mHz - 49 Hz frequency
range, the lack of eclipses and of an IR companion, and the lack of a
$K_{alpha}$ line from neutral or moderately ionized iron strongly disfavor
interpreting this source as a HMXB. We therefore conclude that 1E1743.1-2843 is
most likely a NS-LMXB located beyond the Galactic Center. There is weak
statistical evidence for a soft X-ray excess possibly indicating thermal
emission from an accretion disk. However, the disk normalization remains
unconstrained due to the high hydrogen column density
($N_{H}sim1.6 imes10^{23}~mathrm{cm^{-2}}$). | | Source: | arXiv, 1603.2016 | | Services: | Forum | Review | PDF | Favorites | |
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