MHD Driving of Relativistic Jets
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2007
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| _version_ | 1876477634437709824 |
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| author | Arieh Königl |
| author_facet | Arieh Königl |
| contents | MHD Driving of Relativistic Jets Arieh Königl Física, Astronomía y Matemáticas galaxies: jets Galaxies: active gamma rays: bursts magnetohydrodynamics ISM: jets and outflows There is a growing recognition that magnetic fields play a dominant role in driving and collimating astrophysical jets. Using exact semianalytic solutions of the special-relativistic ideal-MHD equations, it is demonstrated that a strongly magnetized accretion disk (with a dominant poloidal or azimuthal magnetic field) around a blackhole can efficiently accelerate a proton-electron out ow to the Lorentz factors and kinetic energies inferred in gamma-ray burst sources and in active galactic nuclei. The possible contributions of thermal driving (by the pressure of radiation and electron-positron pairs) and of nonideal-MHD effects to the acceleration of the flow are also discussed. It is pointed out that MHD acceleration is distinguished by being spatially extended and that this property should be most noticeable in relativistic ows. It is argued that observational indications that "superluminal" radio jets are accelerated over distances that far exceed the scale of the central black hole support the magnetic-driving picture. Preliminary results of a comprehensive model that could be used to test this interpretation are presented. 2007 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57102710 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.27 |
| format | Artículo científico |
| id | redalyc_57102710 |
| institution | Redalyc |
| language | en |
| publishDate | 2007 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | MHD Driving of Relativistic Jets Arieh Königl Física, Astronomía y Matemáticas galaxies: jets Galaxies: active gamma rays: bursts magnetohydrodynamics ISM: jets and outflows MHD Driving of Relativistic Jets Arieh Königl Física, Astronomía y Matemáticas galaxies: jets Galaxies: active gamma rays: bursts magnetohydrodynamics ISM: jets and outflows There is a growing recognition that magnetic fields play a dominant role in driving and collimating astrophysical jets. Using exact semianalytic solutions of the special-relativistic ideal-MHD equations, it is demonstrated that a strongly magnetized accretion disk (with a dominant poloidal or azimuthal magnetic field) around a blackhole can efficiently accelerate a proton-electron out ow to the Lorentz factors and kinetic energies inferred in gamma-ray burst sources and in active galactic nuclei. The possible contributions of thermal driving (by the pressure of radiation and electron-positron pairs) and of nonideal-MHD effects to the acceleration of the flow are also discussed. It is pointed out that MHD acceleration is distinguished by being spatially extended and that this property should be most noticeable in relativistic ows. It is argued that observational indications that "superluminal" radio jets are accelerated over distances that far exceed the scale of the central black hole support the magnetic-driving picture. Preliminary results of a comprehensive model that could be used to test this interpretation are presented. 2007 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57102710 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Vol.27 |
| title | MHD Driving of Relativistic Jets |
| topic | Física, Astronomía y Matemáticas galaxies: jets Galaxies: active gamma rays: bursts magnetohydrodynamics ISM: jets and outflows |
| url | https://www.redalyc.org/articulo.oa?id=57102710 |