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NuSTAR View of the 2025 Mini-Outburst of the Black Hole X-ray Binary GRS 1739-278: Spectral and Timing Evolution in the Soft State
Arshad Hussain, Umananda Dev Goswami
We present a dedicated timing and spectral analysis of three NuSTAR observations of the Galactic black hole candidate GRS 1739-278 obtained during the decay of its 2025 mini-outbur…
Reconstructing the Auger UHECR Dipole: A Hybrid Analysis of 4LAC AGNs and Nearby Starburst Galaxies
Swaraj Pratim Sarmah, Umananda Dev Goswami, Sovan Chakraborty
The large-scale dipole anisotropy observed by the Pierre Auger Observatory above ~EeV provides important clues about the origin of ultra-high-energy cosmic rays (UHECRs). In thi…
Ultra-high energy cosmic rays with UFA-15 source model in Bumblebee gravity theory
Swaraj Pratim Sarmah. Pranjal Sarmah, Umananda Dev Goswami
We explore the effects of Bumblebee gravity on the propagation of ultra-high energy cosmic rays (UHECRs) using astrophysical sources modelled in the Unger-Farrar-Anchordoqui (UFA)…
Modelling Cosmic Rays Flux with Pierre Auger and Telescope Array Data in and Theories of Gravity
Swaraj Pratim Sarmah, Umananda Dev Goswami
We investigate the effects of the magnetic field and the redshift on the propagation of galactic and extragalactic cosmic rays (CRs) in a modified theory of gravity (MTG) and an al…
AstroSat Observation of Recent Outburst in the Be/X-ray Binary LS V +4417/RX J0440.9+4431
Arshad Hussain, Umananda Dev Goswami
A Be/X-ray binary system known as RX J0440.9+4431 (or LS V +44 17) is a potential member of the uncommon gamma-ray binary class. With an orbital period of 150 days, this system con…
Anisotropies of Diffusive Ultra-high Energy Cosmic Rays in Gravity Theory
Swaraj Pratim Sarmah, Umananda Dev Goswami
Understanding the anisotropy of ultra high-energy cosmic rays (UHECRs) is crucial for unraveling the origins and propagation mechanisms of these enigmatic particles. In this work,…