2023
DOI: 10.48550/arxiv.2303.04164
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The Spin of a Newborn Black Hole: Swift J1728.9-3613

Abstract: The origin and distribution of stellar-mass black hole spins are a rare window into the progenitor stars and supernova events that create them. Swift J1728.9-3613 is an X-ray binary, likely associated with the supernova remnant G351.9-0.9 (Balakrishnan et al. 2023). A NuSTAR X-ray spectrum of this source during its 2019 outburst reveals reflection from an accretion disk extending to the innermost stable circular orbit. Modeling of the relativistic Doppler shifts and gravitational redshifts imprinted on the spe… Show more

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Cited by 1 publication
(4 citation statements)
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“…When fitting NuSTAR spectra from the two FPM detectors, it is customary to link all parameters of the model for the spectra from the two detectors and to allow a multiplicative constant offset between the spectra. However, this sometimes produces different residuals when fitting the two spectra, especially at low energies 5 keV (see, e.g., Draghis et al 2023). Therefore, instead of adopting a multiplicative constant to account for the difference between the spectra from the two FPM NuSTAR detectors, we allowed the normalizations of the model components to be different for the models describing the two spectra, linking all other parameters.…”
Section: Discussionmentioning
confidence: 99%
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“…When fitting NuSTAR spectra from the two FPM detectors, it is customary to link all parameters of the model for the spectra from the two detectors and to allow a multiplicative constant offset between the spectra. However, this sometimes produces different residuals when fitting the two spectra, especially at low energies 5 keV (see, e.g., Draghis et al 2023). Therefore, instead of adopting a multiplicative constant to account for the difference between the spectra from the two FPM NuSTAR detectors, we allowed the normalizations of the model components to be different for the models describing the two spectra, linking all other parameters.…”
Section: Discussionmentioning
confidence: 99%
“…However, it is important to acknowledge that a BH must accrete 80% of its initial mass to increase its spin from a = 0 to a = 0.9 and 122% of its initial mass to increase its spin from a = 0 to a = 0.99 (Bardeen 1970;Belczynski et al 2008), so a limited reservoir of matter might prevent significant spin changes even in LMXBs. Additionally, works such as Draghis et al (2023) find that even the BHs in intermediate-mass XBs or LMXBs can be born with high spins, not requiring significant accretion.…”
Section: Discussionmentioning
confidence: 99%
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