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astro-ph.HE2026
Spectral study of the outburst decay of the accreting millisecond X-ray pulsar SRGA J144459.2-604207
Amar Deo Chandra
We study the spectra of the accreting X-ray millisecond pulsar SRGA J144459.2-604207 during the 2024 outburst using the Neutron star Interior Composition Explorer (NICER) and Swift…
astro-ph.HE2026
A candidate cyclotron line at 1.89 keV in the ultraluminous X-ray source NGC 4861 X-2
Sinan Allak, Lorenzo Ducci, Valery F. Suleimanov +6
In this Letter, we report the detection of an absorption-like feature at ~1.89 keV in Chandra/ACIS spectra of the ultraluminous X-ray source NGC 4861 X-2, based on the deepest obse…
astro-ph.HE2026
Exploring the magnetic field of the ultraluminous X-ray pulsar NGC 4631 X-8
Amar Deo Chandra
NGC 4631 X-8 is an ultraluminous X-ray pulsar (ULXP) having a spin period of about 9.7 s, discovered using XMM-Newton observations in 2025. The pulsar is known to show one of the l…