NICER discovery that SRGA J144459.2-604207 is an accreting millisecond X-ray pulsar
NICER discovery that SRGA J144459.2-604207 is an accreting millisecond X-ray pulsar
We present the discovery, with the Neutron Star Interior Composition Explorer (NICER), that SRGA J144459.2−604207 is a 447.9 Hz accreting millisecond X-ray pulsar (AMXP), which underwent a 4 week long outburst starting on 2024 February 15. The AMXP resides in a 5.22 hr binary, orbiting a low-mass companion donor with Md > 0.1 M⊙. We report on the temporal and spectral properties from NICER observations during the early days of the outburst, from 2024 February 21 through 2024 February 23, during which NICER also detected a type I X-ray burst that exhibited a plateau lasting ∼6 s. The spectra of the persistent emission were well described by an absorbed thermal blackbody and power-law model, with blackbody temperature kT ≈ 0.9 keV and power-law photon index Γ ≈ 1.9. Time-resolved burst spectroscopy confirmed the thermonuclear nature of the burst, where an additional blackbody component reached a maximum temperature of nearly kT ≈ 3 keV at the peak of the burst. We discuss the nature of the companion as well as the type I X-ray burst.
astro-ph.HE
Ng, Mason
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Ray, Paul S.
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Sanna, Andrea
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Strohmayer, Tod E.
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Papitto, Alessandro
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Illiano, Giulia
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Albayati, Arianna C.
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Altamirano, Diego
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Boztepe, Tuğba
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Güver, Tolga
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Chakrabarty, Deepto
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Arzoumanian, Zaven
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Buisson, D. J. K.
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Ferrara, Elizabeth C.
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Gendreau, Keith C.
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Guillot, Sebastien
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Hare, Jeremy
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Jaisawal, Gaurava K.
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Malacaria, Christian
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Wolff, Michael T.
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Ng, Mason
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Ray, Paul S.
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Sanna, Andrea
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Strohmayer, Tod E.
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Papitto, Alessandro
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Illiano, Giulia
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Albayati, Arianna C.
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Altamirano, Diego
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Boztepe, Tuğba
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Güver, Tolga
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Chakrabarty, Deepto
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Arzoumanian, Zaven
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Buisson, D. J. K.
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Ferrara, Elizabeth C.
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Gendreau, Keith C.
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Guillot, Sebastien
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Hare, Jeremy
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Jaisawal, Gaurava K.
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Malacaria, Christian
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Wolff, Michael T.
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Ng, Mason, Ray, Paul S., Sanna, Andrea, Strohmayer, Tod E., Papitto, Alessandro, Illiano, Giulia, Albayati, Arianna C., Altamirano, Diego, Boztepe, Tuğba, Güver, Tolga, Chakrabarty, Deepto, Arzoumanian, Zaven, Buisson, D. J. K., Ferrara, Elizabeth C., Gendreau, Keith C., Guillot, Sebastien, Hare, Jeremy, Jaisawal, Gaurava K., Malacaria, Christian and Wolff, Michael T.
(2024)
NICER discovery that SRGA J144459.2-604207 is an accreting millisecond X-ray pulsar.
The Astrophysical Journal Letters, 968 (1), [L7].
(doi:10.3847/2041-8213/ad4edb).
Abstract
We present the discovery, with the Neutron Star Interior Composition Explorer (NICER), that SRGA J144459.2−604207 is a 447.9 Hz accreting millisecond X-ray pulsar (AMXP), which underwent a 4 week long outburst starting on 2024 February 15. The AMXP resides in a 5.22 hr binary, orbiting a low-mass companion donor with Md > 0.1 M⊙. We report on the temporal and spectral properties from NICER observations during the early days of the outburst, from 2024 February 21 through 2024 February 23, during which NICER also detected a type I X-ray burst that exhibited a plateau lasting ∼6 s. The spectra of the persistent emission were well described by an absorbed thermal blackbody and power-law model, with blackbody temperature kT ≈ 0.9 keV and power-law photon index Γ ≈ 1.9. Time-resolved burst spectroscopy confirmed the thermonuclear nature of the burst, where an additional blackbody component reached a maximum temperature of nearly kT ≈ 3 keV at the peak of the burst. We discuss the nature of the companion as well as the type I X-ray burst.
Text
2405.00087v2
- Author's Original
Text
Ng_2024_ApJL_968_L7
- Version of Record
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Accepted/In Press date: 14 May 2024
e-pub ahead of print date: 6 June 2024
Keywords:
astro-ph.HE
Identifiers
Local EPrints ID: 496296
URI: http://eprints.soton.ac.uk/id/eprint/496296
ISSN: 2041-8213
PURE UUID: 57007af7-cf9a-47a6-b8bd-73f4c50dc401
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Date deposited: 11 Dec 2024 17:34
Last modified: 12 Dec 2024 02:46
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Contributors
Author:
Mason Ng
Author:
Paul S. Ray
Author:
Andrea Sanna
Author:
Tod E. Strohmayer
Author:
Alessandro Papitto
Author:
Giulia Illiano
Author:
Tuğba Boztepe
Author:
Tolga Güver
Author:
Deepto Chakrabarty
Author:
Zaven Arzoumanian
Author:
D. J. K. Buisson
Author:
Elizabeth C. Ferrara
Author:
Keith C. Gendreau
Author:
Sebastien Guillot
Author:
Jeremy Hare
Author:
Gaurava K. Jaisawal
Author:
Christian Malacaria
Author:
Michael T. Wolff
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