NICER Observations of the 2018 Outburst of XTE J1810-197

Tolga Guver; Ersin Gogus; Eda Vurgun; Teruaki Enoto; Keith C. Gendreau; Takanori Sakamoto; Eric V. Gotthelf; Zaven Arzoumanian; Sebastien Guillot; Gaurava K. Jaisawal; Christian Malacaria; Walid A. Majid

doi:10.3847/2041-8213/ab212d

NICER Observations of the 2018 Outburst of XTE J1810-197

Tolga Guver^*, Ersin Gogus, Eda Vurgun, Teruaki Enoto, Keith C. Gendreau, Takanori Sakamoto, Eric V. Gotthelf, Zaven Arzoumanian, Sebastien Guillot, Gaurava K. Jaisawal, Christian Malacaria, Walid A. Majid

^*Corresponding author for this work

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Abstract

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.

Original language	English
Article number	L30
Journal	Astrophysical Journal Letters
Volume	877
Issue number	2
Number of pages	6
ISSN	2041-8205
DOIs	https://doi.org/10.3847/2041-8213/ab212d
Publication status	Published - 2019

Keywords

Stars: magnetars
Stars: neutron
X-rays: stars

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G ver 2019 ApJL 877 L30Final published version, 426 KB

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@article{6588678e845040788fc8c9ac728be4a4,

title = "NICER Observations of the 2018 Outburst of XTE J1810-197",

abstract = "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.",

keywords = "Stars: magnetars, Stars: neutron, X-rays: stars",

author = "Tolga Guver and Ersin Gogus and Eda Vurgun and Teruaki Enoto and Gendreau, {Keith C.} and Takanori Sakamoto and Gotthelf, {Eric V.} and Zaven Arzoumanian and Sebastien Guillot and Jaisawal, {Gaurava K.} and Christian Malacaria and Majid, {Walid A.}",

year = "2019",

doi = "10.3847/2041-8213/ab212d",

language = "English",

volume = "877",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

publisher = "IOP Publishing",

number = "2",

}

TY - JOUR

T1 - NICER Observations of the 2018 Outburst of XTE J1810-197

AU - Guver, Tolga

AU - Gogus, Ersin

AU - Vurgun, Eda

AU - Enoto, Teruaki

AU - Gendreau, Keith C.

AU - Sakamoto, Takanori

AU - Gotthelf, Eric V.

AU - Arzoumanian, Zaven

AU - Guillot, Sebastien

AU - Jaisawal, Gaurava K.

AU - Malacaria, Christian

AU - Majid, Walid A.

PY - 2019

Y1 - 2019

N2 - 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.

AB - 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.

KW - Stars: magnetars

KW - Stars: neutron

KW - X-rays: stars

U2 - 10.3847/2041-8213/ab212d

DO - 10.3847/2041-8213/ab212d

M3 - Journal article

SN - 2041-8205

VL - 877

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L30

ER -

NICER Observations of the 2018 Outburst of XTE J1810-197

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Keywords

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