NICER Observations of the 2018 Outburst of XTE J1810-197

Guver T., Gogus E., Vurgun E., Enoto T., GENDREAU K. C., SAKAMOTO T., ...Daha Fazla

ASTROPHYSICAL JOURNAL LETTERS, cilt.877, sa.2, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 877 Sayı: 2
  • Basım Tarihi: 2019
  • Doi Numarası: 10.3847/2041-8213/ab212d
  • Dergi Adı: ASTROPHYSICAL JOURNAL LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: stars: magnetars, stars: neutron, X-rays: stars, RESONANT CYCLOTRON SCATTERING, MAGNETIZED NEUTRON-STARS, SOFT GAMMA REPEATERS, VARIABLE SPIN-DOWN, X-RAY-EMISSION, TRANSIENT MAGNETAR, RADIO-EMISSION, DISCOVERY, ABSORPTION, PULSARS
  • İstanbul Üniversitesi Adresli: Evet

Özet

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.