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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; Wolff, Michael T.
Astrophysical journal. Letters, 06/2024, Letnik: 968, Številka: 1Journal Article
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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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