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DC Field | Value | Language |
---|---|---|
dc.citation.endPage | 892 | - |
dc.citation.number | 1 | - |
dc.citation.startPage | 886 | - |
dc.citation.title | ASTROPHYSICAL JOURNAL | - |
dc.citation.volume | 721 | - |
dc.contributor.author | Kang, Hyesung | - |
dc.contributor.author | Ryu, Dongsu | - |
dc.date.accessioned | 2023-12-22T06:44:17Z | - |
dc.date.available | 2023-12-22T06:44:17Z | - |
dc.date.created | 2015-08-28 | - |
dc.date.issued | 2010-09 | - |
dc.description.abstract | We examine the test-particle solution for diffusive shock acceleration, based on simple models for thermal leakage injection and Alfvenic drift. The critical injection rate, xi(c), above which the cosmic-ray (CR) pressure becomes dynamically significant depends mainly on the sonic shock Mach number, M, and preshock gas temperature, T(1). In the hot-phase interstellar medium (ISM) and intracluster medium, xi(c) less than or similar to 10(-3) for shocks with M less than or similar to 5, while xi(c) approximate to 10(-4)(T(1)/10(6) K)(1/2) for shocks with M greater than or similar to 10. For T(1) = 10(6) K, for example, the test-particle solution would be valid if the injection momentum p(inj) >3.8p(th) (where p(th) is thermal momentum). This leads to a postshock CR pressure less than 10% of the shock ram pressure. If the Alfven speed is comparable to the sound speed in the preshock flow, as in the hot-phase ISM, the power-law slope of CR spectrum can be significantly softer than the canonical test-particle slope. Then, the CR spectrum at the shock can be approximated by the revised test-particle power law with an exponential cutoff at the highest accelerated momentum, p(max)(t). An analytic form of the exponential cutoff is also suggested | - |
dc.identifier.bibliographicCitation | ASTROPHYSICAL JOURNAL, v.721, no.1, pp.886 - 892 | - |
dc.identifier.doi | 10.1088/0004-637X/721/1/886 | - |
dc.identifier.issn | 0004-637X | - |
dc.identifier.scopusid | 2-s2.0-78149274280 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/16358 | - |
dc.identifier.url | http://iopscience.iop.org/0004-637X/721/1/886/ | - |
dc.identifier.wosid | 000282192900067 | - |
dc.language | 영어 | - |
dc.publisher | IOP PUBLISHING LTD | - |
dc.title | DIFFUSIVE SHOCK ACCELERATION IN TEST-PARTICLE REGIME | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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