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Upcoming seminar
Upcoming seminar
Date: Apr. 15, 2026 @ 4:00 PM (in-person)
Date: Apr. 15, 2026 @ 4:00 PM (in-person)
Venue: Multimedia Room, Physical Sciences Building, IISc
Venue: Multimedia Room, Physical Sciences Building, IISc
Speaker: Pallavi Bhat (ICTS-TIFR, India)
Speaker: Pallavi Bhat (ICTS-TIFR, India)
Title: Magnetic Reconnection: An Alternative Explanation of Radio Emission in Galaxy Clusters
Title: Magnetic Reconnection: An Alternative Explanation of Radio Emission in Galaxy Clusters
Abstract: Magnetic reconnection is a fundamental process in astrophysical plasmas, underlying a wide range of high-energy phenomena such as flares, storms, and particle acceleration. In this talk, I will explore its potential role in galaxy clusters, where the origin of relativistic particles responsible for diffuse radio emission remains an open question.
Abstract: Magnetic reconnection is a fundamental process in astrophysical plasmas, underlying a wide range of high-energy phenomena such as flares, storms, and particle acceleration. In this talk, I will explore its potential role in galaxy clusters, where the origin of relativistic particles responsible for diffuse radio emission remains an open question.
We propose that dynamo driven magnetic fields in the intracluster medium naturally give rise to reconnection events, which can efficiently re-accelerate particles. Using fully kinetic Particle-In-Cell simulations appropriate for the collisionless plasma conditions in clusters, we demonstrate that reconnection can produce particles with sufficient energies to power the observed nonthermal emission. I will present this model, discuss its implications for cluster radio observations, and outline how it compares with existing acceleration scenarios.
We propose that dynamo driven magnetic fields in the intracluster medium naturally give rise to reconnection events, which can efficiently re-accelerate particles. Using fully kinetic Particle-In-Cell simulations appropriate for the collisionless plasma conditions in clusters, we demonstrate that reconnection can produce particles with sufficient energies to power the observed nonthermal emission. I will present this model, discuss its implications for cluster radio observations, and outline how it compares with existing acceleration scenarios.
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