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ファイル | 記述 | サイズ | フォーマット | |
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PhysRevD.83.023002.pdf | 568.35 kB | Adobe PDF | 見る/開く |
タイトル: | White dwarf pulsars as possible cosmic ray electron-positron factories |
著者: | Kashiyama, Kazumi Ioka, Kunihito https://orcid.org/0000-0002-3517-1956 (unconfirmed) Kawanaka, Norita https://orcid.org/0000-0001-8181-7511 (unconfirmed) |
著者名の別形: | 樫山, 和己 |
発行日: | Jan-2011 |
出版者: | The American Physical Society |
誌名: | Physical Review D |
巻: | 83 |
号: | 2 |
論文番号: | 023002 |
抄録: | We suggest that white dwarf (WD) pulsars can compete with neutron star (NS) pulsars for producing the excesses of cosmic ray electrons and positrons (e[±]) observed by the PAMELA, ATIC/PPB-BETS, Fermi, and H.E.S.S. experiments. A merger of two WDs leads to a rapidly spinning WD with a rotational energy (∼10[50] erg) comparable to the NS case. The birth rate (∼10[-2]–10[-3]/yr/galaxy) is also similar, providing the right energy budget for the cosmic ray e±. Applying the NS theory, we suggest that the WD pulsars can in principle produce e[±] up to ∼10 TeV. In contrast to the NS model, the adiabatic and radiative energy losses of e[±] are negligible since their injection continues after the expansion of the pulsar wind nebula, and hence it is enough that a fraction ∼1% of WDs are magnetized (∼10[7]–10[9] G) as observed. The long activity also increases the number of nearby sources (∼100), which reduces the Poisson fluctuation in the flux. The WD pulsars could dominate the quickly cooling e[±] above TeV energy as a second spectral bump or even surpass the NS pulsars in the observing energy range ∼10 GeV–1 TeV, providing a background for the dark matter signals and a nice target for the future AMS-02, CALET, and CTA experiment. |
著作権等: | © 2011 The American Physical Society. |
URI: | http://hdl.handle.net/2433/138100 |
DOI(出版社版): | 10.1103/PhysRevD.83.023002 |
出現コレクション: | 学術雑誌掲載論文等 |
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