3 papers
astro-ph.HE2025
Variability study of classical supergiant X-ray binary 4U 1907+09 using NuSTAR
Raj Kumar, Sayantan Bhattacharya, Sudip Bhattacharyya +1
We investigate the X-ray variability of the supergiant X-ray binary 4U 1907+09 using the new NuSTAR observation of 2024. The source had a relatively stable flux level during previo…
astro-ph.SR2025
Study of Solar Energetic Particles: their Source Regions, Flares and CMEs during Solar Cycles 23-24
Raj Kumar, Ramesh Chandra, Bimal Pande +1
In this work, we examine the association between solar active regions and 152 solar flares, coronal mass ejections, and solar energetic particle (SEP) events over solar cycles 23-2…
astro-ph.HE2025
Spectro-Polarimetric Study of Weakly Magnetized Neutron Star X-ray binary GX 349+2
Raj Kumar, Subhasish Das
We report the first spectro-polarimetric investigation of the bright Z-type source GX 349+2 using simultaneous observations of \textit{IXPE}, \textit{NuSTAR} and \textit{Swift/XRT}…