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Anti-glitches in the ultraluminous accreting pulsar NGC 300 ULX-1 observed with NICER

Anti-glitches in the ultraluminous accreting pulsar NGC 300 ULX-1 observed with NICER
Anti-glitches in the ultraluminous accreting pulsar NGC 300 ULX-1 observed with NICER
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 (NICER). Our timing analysis reveals three sudden spin-down events of magnitudes dnu = -23, -30, and -43 uHz (fractional amplitudes dnu/nu = -4.4, -5.5, and -7.7x10^-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.
1538-4357
1-11
Ray, Paul S.
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Guillot, Sebastien
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Ho, Wynn C.G.
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Kerr, Matthew
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Enoto, Teruaki
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Gendreau, Keith C.
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Arzoumanian, Zaven
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Altamirano, Diego
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Bogdanov, Slavko
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Campion, Robert
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Chakrabarty, Deepto
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Deneva, Julia S.
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Jaisawal, Gaurava K.
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Kozon, Robert
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Malacaria, Christian
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Strohmayer, Tod E.
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Wolff, Michael T.
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Ray, Paul S.
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Guillot, Sebastien
5d521f37-303f-4a40-9f85-fbb75b960f12
Ho, Wynn C.G.
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Kerr, Matthew
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Enoto, Teruaki
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Gendreau, Keith C.
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Arzoumanian, Zaven
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Altamirano, Diego
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Bogdanov, Slavko
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Campion, Robert
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Chakrabarty, Deepto
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Deneva, Julia S.
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Jaisawal, Gaurava K.
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Kozon, Robert
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Malacaria, Christian
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Strohmayer, Tod E.
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Wolff, Michael T.
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Ray, Paul S., Guillot, Sebastien, Ho, Wynn C.G., Kerr, Matthew, Enoto, Teruaki, Gendreau, Keith C., Arzoumanian, Zaven, Altamirano, Diego, Bogdanov, Slavko, Campion, Robert, Chakrabarty, Deepto, Deneva, Julia S., Jaisawal, Gaurava K., Kozon, Robert, Malacaria, Christian, Strohmayer, Tod E. and Wolff, Michael T. (2019) Anti-glitches in the ultraluminous accreting pulsar NGC 300 ULX-1 observed with NICER. Astrophysical Journal, 879 (2), 1-11, [130]. (doi:10.3847/1538-4357/ab24d8).

Record type: Article

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 (NICER). Our timing analysis reveals three sudden spin-down events of magnitudes dnu = -23, -30, and -43 uHz (fractional amplitudes dnu/nu = -4.4, -5.5, and -7.7x10^-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.

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1811.09218 - Accepted Manuscript
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Accepted/In Press date: 26 May 2019
e-pub ahead of print date: 16 July 2019

Identifiers

Local EPrints ID: 431490
URI: http://eprints.soton.ac.uk/id/eprint/431490
ISSN: 1538-4357
PURE UUID: ff0fd946-6d52-4851-8027-a19b180d8110
ORCID for Wynn C.G. Ho: ORCID iD orcid.org/0000-0002-6089-6836
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 05 Jun 2019 16:30
Last modified: 16 Mar 2024 07:53

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Contributors

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

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