The 11 yr of low activity of the magnetar XTE J1810−197

Fabio Pintore, Sandro Mereghetti, Paolo Esposito, Roberto Turolla, Andrea Tiengo, Nanda Rea, Federico Bernardini, Gian Luca Israel

    Research output: Contribution to journalArticlepeer-review


    In 2003, the magnetar XTE J1810−197 started an outburst that lasted until early 2007. In the following 11 yr, the source stayed in a quiescent/low-activity phase. XTE J1810−197 is one of the closest magnetars, hence its X-ray properties can be studied in detail even in quiescence and an extended monitoring has been carried out to study its long-term timing and spectral evolution. Here, we report the results of new X-ray observations, taken between 2017 September and 2018 April, with XMM–Newton, Chandra, and NICER. We derived a phase-connected timing solution yielding a frequency derivative of −9.26(6) × 10−14 Hz s−1. This value is consistent with that measured between 2009 and 2011, indicating that the pulsar spin-down rate remained quite stable during the long quiescent period. A spectral analysis of all the X-ray observations taken between 2009 and 2018 does not reveal significant spectral and/or flux variability. The spectrum of XTE J1810−197 can be described by the sum of two thermal components with temperatures of 0.15 and 0.3 keV, plus a power-law component with photon index 0.6. We also found evidence for an absorption line at ∼1.2 keV and width of 0.1 keV. Due to the long exposure time of the summed XMM–Newton observations, we could also carry out a phase-resolved spectral analysis for this source in quiescence. This showed that the flux modulation can be mainly ascribed to the warmer of the two thermal components, whose flux varies by ∼45 per cent along the pulse phase.

    Original languageEnglish (US)
    Pages (from-to)3832-3838
    Number of pages7
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number3
    StatePublished - Mar 1 2019


    • Magnetic fields
    • Pulsars: individual: XTE J1810-197
    • Stars: magnetars
    • Stars: neutron
    • X-rays: stars

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science


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