NICER observations of the 2018 outburst of XTE J1810-197

Güver, Tolga and Göğüş, Ersin and Vurgun, Eda and Enoto, Teruaki and Gendreau, Keith C. and Sakamoto, Takanori and Gotthelf, Eric V. and Arzoumanian, Zaven and Guillot, Sebastien and Jaisawal, Gaurava K. and Malacaria, Christian and Majid, Walid A. (2019) NICER observations of the 2018 outburst of XTE J1810-197. Astrophysical Journal Letters, 877 (2). ISSN 2041-8205 (Print) 2041-8213 (Online)

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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) x 10(-10) to (1.125 +/- 0.004) x 10(-10) erg s(-1) cm(-2), 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.
Item Type: Article
Uncontrolled Keywords: stars: magnetars; stars: neutron; X-rays: stars
Subjects: Q Science > QB Astronomy > QB460-466 Astrophysics
Divisions: Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences
Depositing User: Ersin Göğüş
Date Deposited: 27 Aug 2019 15:35
Last Modified: 24 Jul 2023 22:13

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