Seminars

Wednesday Colloquium

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The Colloquium takes place every Wednesday at 11:15 AM - Warsaw Copernicus Astronomical Centre online by means of Zoom platform. The Colloquium is given in English and chaired by dr Stanisław Bajtlik (bajtlik@camk.edu.pl)People from outside of the Copernicus Center are very welcome to participate. For technical detailes please contact Dr. Stanislaw Bajtlik.



03.04.2024

"Magnetic flux saturation mechanism at accreting black holes"

Krzysztof Nalewajko (CAMK, Warsaw)

Black holes (BH) acquire relativistic magnetospheres by accreting magnetized gas. Once they collect significant magnetic flux across the horizon, aided by the spin they can drive powerful relativistic jets by the Blandford-Znajek mechanism. Large enough BH magnetic flux backreacts on the accretion flow, which has been described in terms of arresting or choking. Magnetic flux eruptions have been identified as the mechanism of BH magnetic flux saturation. These eruptions can potentially dissipate a large fraction of magnetic energy in the BH magnetosphere by means of relativistic magnetic reconnection, accelerating particles and producing flares of non-thermal radiation. We analyze the results of 3D general-relativistic ideal magnetohydrodynamic (GRMHD) numerical simulations of accretion flows onto magnetically saturated Kerr BHs, focusing on the initiation of magnetic flux eruptions.


 


Special seminars

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Journal Club

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Journal Club takes place on Mondays at 11:00 AM in the Seminar Room. The seminar is given in English and is chaired by Angelos  Karakonstantakis, Gergely Hajdu, and Fatemeh Kayanikhoo.



 


The Bohdan Paczyński Memorial Colloquium

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GeoPlanet Seminars

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