From the 1 of 5 linked papers with an AI index.
5 papers
Spectral study of the outburst decay of the accreting millisecond X-ray pulsar SRGA J144459.2-604207
Amar Deo Chandra
The paper analyzes NICER and Swift X‑ray observations of the accreting millisecond pulsar SRGA J144459.2-604207 during its 2024 outburst, studying spectral evolution from outburst…
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…
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…
Study on the magnetic field of the ultraluminous X-ray pulsar RX J0209.6-7427
Amar Deo Chandra
RX J0209.6-7427 is an ultraluminous X-ray pulsar (ULXP) having spin period of about 9.3 s. To date, no cyclotron resonance scattering features have been detected in this source, wh…
Long-term spin-down and low luminosity regime in the Be/X-ray binary pulsar GX 304-1
Amar Deo Chandra
We carry out timing and spectral studies of the Be/X-ray binary pulsar GX 304-1 using NuStar and XMM-Newton observations. We construct the long-term spin period evolution of the pu…