Academic Journal
The spectral shape of shock-accelerated particles.
| Τίτλος: | The spectral shape of shock-accelerated particles. |
|---|---|
| Συγγραφείς: | Xu, Y. D.1,2 (AUTHOR), Li, G.1 (AUTHOR) gli@must.edu.mo |
| Πηγή: | Astronomy & Astrophysics / Astronomie et Astrophysique. 2026, Vol. 713, p1-6. 6p. |
| Θεματικοί όροι: | *Exponential decay law, *Scale invariance (Statistical physics), *Gamma rays, *Mechanical shock, *Transport equation |
| People: | Parker, William Anthony, 1982- |
| Περίληψη: | Context. Particle acceleration at collisionless shocks, governed by Parker's transport equation, is frequently characterized by a power-law energy spectrum with an exponential cutoff, typically taking the form ∼E−γexp(−E/E0). In high-energy astrophysics, the exponential decay is often generalized to ∼exp(−(E/E0)β) to model both Galactic cosmic rays and gamma-ray spectra. Aims. We aim to propose a new spectral fitting formalism governed entirely by physically interpretable parameters, providing a comprehensive framework for interpreting observed energy spectra across space plasmas and high-energy astrophysics. Methods. Operating within the test-particle regime of diffusive shock acceleration, we derive a novel approximant for the energy spectrum of accelerated particles in the context of nonrelativistic piecewise shocks. Results. Our formulation reveals a previously uncharacterized transitional phase in the energy spectrum, situated between the canonical low-energy power-law distribution and the high-energy exponential decay asymptote. Furthermore, this approach demonstrates the emergence of robust spectral self-similarity across different ion species and temporal stages of the acceleration process. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
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| Header | DbId: asx DbLabel: Academic Search Index An: 197592420 RelevancyScore: 1452 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 1452.42749023438 |
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| Items | – Name: Title Label: Title Group: Ti Data: The spectral shape of shock-accelerated particles. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Xu%2C+Y%2E+D%2E%22">Xu, Y. D.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+G%2E%22">Li, G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> gli@must.edu.mo</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Astronomy+%26+Astrophysics+%2F+Astronomie+et+Astrophysique%22">Astronomy & Astrophysics / Astronomie et Astrophysique</searchLink>. 2026, Vol. 713, p1-6. 6p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Exponential+decay+law%22">Exponential decay law</searchLink><br />*<searchLink fieldCode="DE" term="%22Scale+invariance+%28Statistical+physics%29%22">Scale invariance (Statistical physics)</searchLink><br />*<searchLink fieldCode="DE" term="%22Gamma+rays%22">Gamma rays</searchLink><br />*<searchLink fieldCode="DE" term="%22Mechanical+shock%22">Mechanical shock</searchLink><br />*<searchLink fieldCode="DE" term="%22Transport+equation%22">Transport equation</searchLink> – Name: SubjectPerson Label: People Group: Su Data: <searchLink fieldCode="PE" term="%22Parker%2C+William+Anthony%2C+1982-%22">Parker, William Anthony, 1982-</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Context. Particle acceleration at collisionless shocks, governed by Parker's transport equation, is frequently characterized by a power-law energy spectrum with an exponential cutoff, typically taking the form ∼E−γexp(−E/E0). In high-energy astrophysics, the exponential decay is often generalized to ∼exp(−(E/E0)β) to model both Galactic cosmic rays and gamma-ray spectra. Aims. We aim to propose a new spectral fitting formalism governed entirely by physically interpretable parameters, providing a comprehensive framework for interpreting observed energy spectra across space plasmas and high-energy astrophysics. Methods. Operating within the test-particle regime of diffusive shock acceleration, we derive a novel approximant for the energy spectrum of accelerated particles in the context of nonrelativistic piecewise shocks. Results. Our formulation reveals a previously uncharacterized transitional phase in the energy spectrum, situated between the canonical low-energy power-law distribution and the high-energy exponential decay asymptote. Furthermore, this approach demonstrates the emergence of robust spectral self-similarity across different ion species and temporal stages of the acceleration process. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/0004-6361/202661710 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 1 Subjects: – SubjectFull: Parker, William Anthony, 1982- Type: general – SubjectFull: Exponential decay law Type: general – SubjectFull: Scale invariance (Statistical physics) Type: general – SubjectFull: Gamma rays Type: general – SubjectFull: Mechanical shock Type: general – SubjectFull: Transport equation Type: general Titles: – TitleFull: The spectral shape of shock-accelerated particles. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Xu, Y. D. – PersonEntity: Name: NameFull: Li, G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: 2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00046361 Numbering: – Type: volume Value: 713 Titles: – TitleFull: Astronomy & Astrophysics / Astronomie et Astrophysique Type: main |
| ResultId | 1 |