17 citations · 17 across the 8 of their papers we have counts for
10 papers · 1 filter
A Standard Ultraviolet Continuum Can Hide Supercritical Accretion in GN-z11
Samik Mitra, Ramananda Santra
The ultraviolet continuum from a high-redshift accreting black hole is routinely used to infer its mass. GN-z11 offers a sharp test of whether that inference is secure. A thin-disk…
Can Isotropic Thermal Conduction Heat One of the Hottest Cool Cores?
Samik Mitra, Ramananda Santra, Norbert Werner
Thermal conduction can act as a heating mechanism for cool-core clusters, yet the same transport must erode any temperature discontinuity it crosses. Ophiuchus permits both effects…
Validating Inverse Fundamental-Plane IMBH Mass Estimates in the SKA/ngVLA Era
Shahram Abbassi, Samik Mitra, Ramananda Santra
The radio/X-ray/black-hole-mass Fundamental Plane (FP) is widely used to estimate masses of accreting intermediate-mass black hole (IMBH) candidates. Its inverse use is justified o…
Low-angular-momentum accretion shocks can power weak-to-moderate X-ray flares from SgrA*
Samik Mitra, Bożena Czerny, Michal Zajaček +1
X-ray flares from Sgr~A* span broad ranges in duration, fluence, and luminosity, but their origin remains unsettled. We test whether standing shocks in low-angular-momentum magneti…
Thermal Stability of Radiation-Pressure-Dominated Accretion Disks Threaded by Net Vertical Magnetic Flux
Shahram Abbassi, Armin Memarian, Samik Mitra
The classical radiation-pressure instability predicts strong thermal variability in luminous black-hole accretion disks, whereas most disk-dominated X-ray binary soft states remain…
Properties of low angular momentum general relativistic MHD accretion flows around black holes
Samik Mitra
In this proceeding, we provide a novel approach to study the General Relativistic Magnetohydrodynamic (GRMHD) accretion flows around rotating black holes (BHs). In doing so, we cho…