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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Universe |
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| Online Access: | https://www.mdpi.com/2218-1997/7/1/1 |
| _version_ | 1818062250792976384 |
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| author | Yasufumi Kojima Yuto Kimura |
| author_facet | Yasufumi Kojima Yuto Kimura |
| author_sort | Yasufumi Kojima |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-10T14:01:14Z |
| format | Article |
| id | doaj.art-f6734820a42c4bd086a57e739b73b852 |
| institution | Directory Open Access Journal |
| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-12-10T14:01:14Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Universe |
| spelling | doaj.art-f6734820a42c4bd086a57e739b73b8522022-12-22T01:45:48ZengMDPI AGUniverse2218-19972020-12-0171110.3390/universe7010001Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black HoleYasufumi Kojima0Yuto Kimura1Department of Physics, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanDepartment of Physics, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanShort 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.https://www.mdpi.com/2218-1997/7/1/1black holemagnetic fieldflareaccelerationcosmic rays |
| spellingShingle | Yasufumi Kojima Yuto Kimura Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole Universe black hole magnetic field flare acceleration cosmic rays |
| title | Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole |
| title_full | Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole |
| title_fullStr | Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole |
| title_full_unstemmed | Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole |
| title_short | Particle Acceleration Driven by Null Electromagnetic Fields Near a Kerr Black Hole |
| title_sort | particle acceleration driven by null electromagnetic fields near a kerr black hole |
| topic | black hole magnetic field flare acceleration cosmic rays |
| url | https://www.mdpi.com/2218-1997/7/1/1 |
| work_keys_str_mv | AT yasufumikojima particleaccelerationdrivenbynullelectromagneticfieldsnearakerrblackhole AT yutokimura particleaccelerationdrivenbynullelectromagneticfieldsnearakerrblackhole |