Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole
Short timescale variability is often associated with a black hole system. The consequence of an electromagnetic outflow suddenly generated near a Kerr black hole is considered assuming that it is described by a solution of a force-free field with a null electric current. We compute charged particle...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-12-01
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| Series: | Universe |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2218-1997/7/1/1 |
| Summary: | Short timescale variability is often associated with a black hole system. The consequence of an electromagnetic outflow suddenly generated near a Kerr black hole is considered assuming that it is described by a solution of a force-free field with a null electric current. We compute charged particle acceleration induced by the burst field. We show that the particle is instantaneously accelerated to the relativistic regime by the field with a very large amplitude, which is characterized by a dimensionless number <inline-formula><math display="inline"><semantics><mi>κ</mi></semantics></math></inline-formula>. Our numerical calculation demonstrates how the trajectory of the particle changes with <inline-formula><math display="inline"><semantics><mi>κ</mi></semantics></math></inline-formula>. We also show that the maximum energy increases with <inline-formula><math display="inline"><semantics><msup><mi>κ</mi><mrow><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msup></semantics></math></inline-formula>. The typical maximum energy attained by a proton for an event near a super massive black hole is <inline-formula><math display="inline"><semantics><mrow><msub><mi>E</mi><mi>max</mi></msub><mo>∼</mo><mn>100</mn></mrow></semantics></math></inline-formula> TeV, which is enough observed high-energy flares. |
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| ISSN: | 2218-1997 |