Origin of the Positron Excess in Cosmic Rays

被引：268

作者：

Blasi, Pasquale ^{[1
]}

机构：

[1] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 05期

关键词：

ACCELERATION; FRACTION; ENERGIES;

D O I：

10.1103/PhysRevLett.103.051104

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the positron excess measured by the PAMELA experiment in the region between 10 and 100 GeV may well be a natural consequence of the standard scenario for the origin of Galactic cosmic rays. The "excess'' arises because of positrons created as secondary products of hadronic interactions inside the sources, but the crucial physical ingredient which leads to a natural explanation of the positron flux is the fact that the secondary production takes place in the same region where cosmic rays are being accelerated. Therefore secondary positrons (and electrons) participate in the acceleration process and turn out to have a very flat spectrum, which is responsible, after propagation in the Galaxy, for the observed positron excess. This effect cannot be avoided though its strength depends on the values of the environmental parameters during the late stages of evolution of supernova remnants.

引用

页数：4

共 21 条

[1] Measurement of the Cosmic Ray e++e- Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Battelino, M. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bogaert, G. ;

Bonamente, E. ;

Borgland, A. W. ;

Bregeon, J. ;

Brez, A. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carlson, P. ;

Casandjian, J. M. ;

Cecchi, C. ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Conrad, J. ;

Cutini, S. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

Digel, S. W. ;

Di Bernardo, G. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Edmonds, Y. .

PHYSICAL REVIEW LETTERS, 2009, 102 (18)

[2] An anomalous positron abundance in cosmic rays with energies 1.5-100 GeV [J].

Adriani, O. ;

Barbarino, G. C. ;

Bazilevskaya, G. A. ;

Bellotti, R. ;

Boezio, M. ;

Bogomolov, E. A. ;

Bonechi, L. ;

Bongi, M. ;

Bonvicini, V. ;

Bottai, S. ;

Bruno, A. ;

Cafagna, F. ;

Campana, D. ;

Carlson, P. ;

Casolino, M. ;

Castellini, G. ;

De Pascale, M. P. ;

De Rosa, G. ;

De Simone, N. ;

Di Felice, V. ;

Galper, A. M. ;

Grishantseva, L. ;

Hofverberg, P. ;

Koldashov, S. V. ;

Krutkov, S. Y. ;

Kvashnin, A. N. ;

Leonov, A. ;

Malvezzi, V. ;

Marcelli, L. ;

Menn, W. ;

Mikhailov, V. V. ;

Mocchiutti, E. ;

Orsi, S. ;

Osteria, G. ;

Papini, P. ;

Pearce, M. ;

Picozza, P. ;

Ricci, M. ;

Ricciarini, S. B. ;

Simon, M. ;

Sparvoli, R. ;

Spillantini, P. ;

Stozhkov, Y. I. ;

Vacchi, A. ;

Vannuccini, E. ;

Vasilyev, G. ;

Voronov, S. A. ;

Yurkin, Y. T. ;

Zampa, G. ;

Zampa, N. .

NATURE, 2009, 458 (7238) :607-609

[3] Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01 [J].

Aguilar, M. ;

Alcaraz, J. ;

Allaby, J. ;

Alpat, B. ;

Ambrosi, G. ;

Anderhub, H. ;

Ao, L. ;

Arefiev, A. ;

Azzarello, P. ;

Baldini, L. ;

Basile, M. ;

Barancourt, D. ;

Barao, F. ;

Barbier, G. ;

Barreira, G. ;

Battiston, R. ;

Becker, R. ;

Becker, U. ;

Bellagamba, L. ;

Bene, P. ;

Berdugo, J. ;

Berges, R. ;

Bertucci, B. ;

Biland, A. ;

Blasko, S. ;

Boella, G. ;

Boschini, M. ;

Bourquin, M. ;

Brocco, L. ;

Bruni, G. ;

Buenerd, M. ;

Burger, J. D. ;

Burger, W. J. ;

Cai, X. D. ;

Camps, C. ;

Cannarsa, P. ;

Capell, M. ;

Cardano, F. ;

Casadei, D. ;

Casaus, J. ;

Castellini, G. ;

Chang, Y. H. ;

Chen, H. F. ;

Chen, H. S. ;

Chen, Z. G. ;

Chernoplekov, N. A. ;

Chiueh, T. H. ;

Cho, K. ;

Choi, M. J. ;

Choi, Y. Y. .

PHYSICS LETTERS B, 2007, 646 (04) :145-154

[4] Energy Spectrum of Cosmic-Ray Electrons at TeV Energies [J].

Aharonian, F. ;

Akhperjanian, A. G. ;

Barres de Almeida, U. ;

Bazer-Bachi, A. R. ;

Becherini, Y. ;

Behera, B. ;

Benbow, W. ;

Bernloehr, K. ;

Boisson, C. ;

Bochow, A. ;

Borrel, V. ;

Braun, I. ;

Brion, E. ;

Brucker, J. ;

Brun, P. ;

Buehler, R. ;

Bulik, T. ;

Buesching, I. ;

Boutelier, T. ;

Carrigan, S. ;

Chadwick, P. M. ;

Charbonnier, A. ;

Chaves, R. C. G. ;

Cheesebrough, A. ;

Chounet, L. -M. ;

Clapson, A. C. ;

Coignet, G. ;

Costamante, L. ;

Dalton, M. ;

Degrange, B. ;

Deil, C. ;

Dickinson, H. J. ;

Djannati-Atai, A. ;

Domainko, W. ;

Drury, L. O'C. ;

Dubois, F. ;

Dubus, G. ;

Dyks, J. ;

Dyrda, M. ;

Egberts, K. ;

Emmanoulopoulos, D. ;

Espigat, P. ;

Farnier, C. ;

Feinstein, F. ;

Fiasson, A. ;

Foerster, A. ;

Fontaine, G. ;

Fuessling, M. ;

Gabici, S. ;

Gallant, Y. A. .

PHYSICAL REVIEW LETTERS, 2008, 101 (26)

[5] Measurements of the cosmic-ray positron fraction from 1 to 50 GeV [J].

Barwick, SW ;

Beatty, JJ ;

Bhattacharyya, A ;

Bower, CR ;

Chaput, CJ ;

Coutu, S ;

deNolfo, GA ;

Knapp, J ;

Lowder, DM ;

McKee, S ;

Muller, D ;

Musser, JA ;

Nutter, SL ;

Schneider, E ;

Swordy, SP ;

Tarle, G ;

Tomasch, AD ;

Torbet, E .

ASTROPHYSICAL JOURNAL, 1997, 482 (02) :L191-L194

[6] ACCELERATION OF COSMIC-RAYS IN SHOCK FRONTS .1. [J].

BELL, AR .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1978, 182 (01) :147-156

[7] PARTICLE-ACCELERATION AT ASTROPHYSICAL SHOCKS - A THEORY OF COSMIC-RAY ORIGIN [J].

BLANDFORD, R ;

EICHLER, D .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1987, 154 (01) :1-75

[8]

BLASI P, ARXIV09040871

[9] A cosmic-ray positron anisotropy due to two middle-aged, nearby pulsars? [J].

Busching, I. ;

De Jager, O. C. ;

Potgieter, M. S. ;

Venter, C. .

ASTROPHYSICAL JOURNAL LETTERS, 2008, 678 (01) :L39-L42

[10]

CAPRIOLI D, IN PRESS

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