NICER Observations of the 2018 Outburst of XTE J1810−197

We present the earliest available soft X-ray observations of XTE J1810−197, the prototypical transient magnetar, obtained 75-84 days after its 2018 outburst with the Neutron Star Interior Composition Explorer. Using a series of observations covering eight days we find that its decreasing X-ray flux...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2019-06, Vol.877 (2), p.L30
Main Authors: Güver, Tolga, Gö ü, Ersin, Vurgun, Eda, Enoto, Teruaki, Gendreau, Keith C., Sakamoto, Takanori, Gotthelf, Eric V., Arzoumanian, Zaven, Guillot, Sebastien, Jaisawal, Gaurava K., Malacaria, Christian, Majid, Walid A.
Format: Article
Language:English
Subjects:
Astrophysics
Blackbody
Magnetars
Neutron flux
Neutron stars
Neutrons
Physics
Power law
Pulsar magnetospheres
Pulsars
Soft x rays
Spectroscopy
stars: magnetars
stars: neutron
X-ray fluxes
X-rays: stars
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Summary:We present the earliest available soft X-ray observations of XTE J1810−197, the prototypical transient magnetar, obtained 75-84 days after its 2018 outburst with the Neutron Star Interior Composition Explorer. Using a series of observations covering eight days we find that its decreasing X-ray flux is well described by either a blackbody plus power law or a two-blackbody spectral model. The 2-10 keV flux of the source varied from (1.206 0.007) × 10−10 to , a decrease of about 7% within our observations and 44% from that measured 7-14 days after the outburst with NuSTAR. We confirm that the pulsed fraction and spin pulse phase of the neutron star are energy dependent up to at least 8 keV. Phase-resolved spectroscopy of the pulsar suggests magnetospheric variations relative to the line of sight.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/ab212d