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Koushik Chatterjee

Publications and source records attributed to Koushik Chatterjee.

4 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS2022

The Event Horizon Explorer Mission Concept

The Event Horizon Explorer (EHE) is a mission concept to extend the Event Horizon Telescope via anadditional space-based node. We provide highlights and overview of a concept study to explore the feasibility ofsuch a mission. We present science goals and objectives, which include studying the immediate environment aroundsupermassive black holes, and focus on critical enabling technologies and engineering challenges. We provide anassessment of their technological readiness and overall suitability for a NASA Medium Explorer (MIDEX) class mission.

Peter Kurczynski↗
NASA NTRS2019

The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project

Recent developments in compact object astrophysics, especially the discovery of merging neutron stars by LIGO, the imaging of the black hole in M87 by the Event Horizon Telescope, and high- precision astrometry of the Galactic Center at close to the event horizon scale by the GRAVITY experiment motivate the development of numerical source models that solve the equations of general relativistic magnetohydrodynamics (GRMHD). Here we compare GRMHD solutions for the evolution of a magnetized accretion flow where turbulence is promoted by the magnetorotational instability from a set of nine GRMHD codes: Athena++, BHAC, Cosmos++, ECHO, H-AMR, iharm3D, HARM-Noble, IllinoisGRMHD, and KORAL. Agreement among the codes improves as resolution increases, as measured by a consistently applied, specially developed set of code performance metrics. We conclude that the community of GRMHD codes is mature, capable, and consistent on these test problems.

relativistic processes↗