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2020-02

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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/199982

Resolving the Crab pulsar wind nebula at teraelectronvolt energies

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https://doi.org/10.1038/s41550-019-0910-0

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The Crab nebula is one of the most-studied cosmic particle accelerators, shining brightly across the entire electromagnetic spectrum up to very-high-energy gamma rays1,2. It is known from observations in the radio to gamma-ray part of the spectrum that the nebula is powered by a pulsar, which converts most of its rotational energy losses into a highly relativistic outflow. This outflow powers a pulsar wind nebula, a region of up to ten light-years across, filled with relativistic electrons and positrons. These particles emit synchrotron photons in the ambient magnetic field and produce very-high-energy gamma rays by Compton up-scattering of ambient low-energy photons. Although the synchrotron morphology of the nebula is well established, it has not been known from which region the very-high-energy gamma rays are emitted3,4,5,6,7,8. Here we report that the Crab nebula has an angular extension at gamma-ray energies of 52 arcseconds (assuming a Gaussian source width), much larger than at X-ray energies. This result closes a gap in the multi-wavelength coverage of the nebula, revealing the emission region of the highest-energy gamma rays. These gamma rays enable us to probe a previously inaccessible electron and positron energy range. We find that simulations of the electromagnetic emission reproduce our measurement, prov

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Raigs gamma, Camps magnètics

Matèries (anglès)

Gamma rays, Magnetic fields

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Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Citació

H. E. S. S. Collaboration, CERRUTI, Matteo, BORDAS COMA, Pol. Resolving the Crab pulsar wind nebula at teraelectronvolt energies. _Nature Astronomy_. 2020. Vol. 4, núm. 167-173. [consulta: 23 de gener de 2026]. ISSN: 2397-3366. [Disponible a: https://hdl.handle.net/2445/199982]

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