Journal article · Preprint article
Anti-glitches in the Ultraluminous Accreting Pulsar NGC 300 ULX-1 Observed with NICER
U.S. Naval Research Laboratory1
Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark2
National Space Institute, Technical University of Denmark3
NASA Marshall Space Flight Center4
Université Fédérale Toulouse Midi-Pyrénées5
University of Southampton6
Kyoto University7
NASA Goddard Space Flight Center8
Columbia University9
Chesapeake Aerospace Engineering, Inc.10
Massachusetts Institute of Technology11
George Mason University12
...and 2 moreWe 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.
Language: | English |
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Year: | 2019 |
ISSN: | 15384357 and 0004637x |
Types: | Journal article and Preprint article |
DOI: | 10.3847/1538-4357/ab24d8 |
ORCIDs: | Jaisawal, Gaurava K. |