Anti-glitches in the Ultraluminous Accreting Pulsar NGC 300 ULX-1 Observed with NICER

Paul S. Ray, Sebastien Guillot, Wynn C. G. Ho, Matthew Kerr, Teruaki Enoto, Keith C. Gendreau, Zaven Arzoumanian, Diego Altamirano, Slavko Bogdanov, Robert Campion, Deepto Chakrabarty, Julia S. Deneva, Gaurava K. Jaisawal, Robert Kozon, Christian Malacaria, Tod E. Strohmayer, Michael T. Wolff

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    Abstract

    We present evidence for three spin-down glitches (or “anti-glitches”) in the ultraluminous accreting X-ray pulsar NGC 300 ULX-1, in timing observations made with the Neutron Star Interior Composition Explorer. Our timing analysis reveals three sudden spin-down events of magnitudes Δν = −23, −30, and −43 μHz (fractional amplitudes Δν/ν = −4.4, −5.5, and −7.7 × 10−4). We determined fully phase-coherent timing solutions through the first two glitches, giving us high confidence in their detection, while the third candidate glitch is somewhat less secure. These are larger in magnitude (and opposite in sign) than any known radio pulsar glitch. This may be caused by the prolonged rapid spin up of the pulsar, causing a sudden transfer of angular momentum between the superfluid and non-superfluid components of the star. We find no evidence for profile or spectral changes at the epochs of the glitches, supporting the conclusion that these are due to the same process as in normal pulsar glitches, but in reverse.
    Original languageEnglish
    Article number130
    JournalAstrophysical Journal
    Volume879
    Issue number2
    Number of pages11
    ISSN0004-637X
    DOIs
    Publication statusPublished - 2019

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