Maximum synchrotron frequency for shock-accelerated particles

被引：45

作者：

Kumar, P. ^{[1
]}

Hernandez, R. A. ^{[2
]}

Bosnjak, Z. ^{[3
]}

Duran, R. Barniol ^{[4
]}

机构：

[1] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[2] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

[3] Univ Paris Diderot, AIM, Irfu Serv Astrophys, UMR 7158,CEA,DSM,CNRS, F-91191 Gif Sur Yvette, France

[4] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 427卷 / 01期

基金：

美国国家科学基金会;

关键词：

radiation mechanisms: non-thermal; methods: analytical; gamma-ray burst: general; GAMMA-RAY BURST; HIGH-ENERGY EMISSION; MAGNETIC-FIELDS; FERMI OBSERVATIONS; COSMIC-RAYS; GRB; 090510; AFTERGLOW; COMPONENT; PARAMETERS; EVOLUTION;

D O I：

10.1111/j.1745-3933.2012.01341.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

It is widely believed that the maximum energy of synchrotron photons when electrons are accelerated in shocks via the Fermi process is about 50 MeV (in plasma comoving frame). We show that under certain conditions, which are expected to be realized in relativistic shocks of gamma-ray bursts, synchrotron photons of energy much larger than 50 MeV (comoving frame) can be produced. The requirement is that magnetic field should decay downstream of the shock front on a length-scale that is small compared with the distance travelled by the highest energy electrons before they lose half their energy; photons of energy much larger than 50 MeV are produced close to the shock front, whereas the highest Lorentz factor that electrons can attain is controlled by the much weaker field that occupies most of the volume of the shocked plasma.

引用

页码：L40 / L44

页数：5

共 43 条

[1] FERMI DETECTION DELAYED GeV EMISSION FROM THE SHORT GAMMA-RAY BURST 081024B [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Asano, K. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Bhat, P. N. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Briggs, M. S. ;

Brigida, M. ;

Bruel, P. ;

Burgess, J. M. ;

Burnett, T. H. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, Oe ;

Chaplin, V. ;

Charles, E. ;

Chekhtman, A. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Connaughton, V. ;

Conrad, J. ;

Cutini, S. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. .

ASTROPHYSICAL JOURNAL, 2010, 712 (01) :558-564

[2] FERMI OBSERVATIONS OF GRB 090902B: A DISTINCT SPECTRAL COMPONENT IN THE PROMPT AND DELAYED EMISSION [J].

Abdo, A. A. ;

Ackermann, M. ;

Ajello, M. ;

Asano, K. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Baring, M. G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Bhat, P. N. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Briggs, M. S. ;

Brigida, M. ;

Bruel, P. ;

Burgess, J. M. ;

Burrows, D. N. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, Oe. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Cominsky, L. R. ;

Connaughton, V. ;

Conrad, J. ;

Cutini, S. ;

d'Elia, V. ;

Dermer, C. D. ;

de Angelis, A. ;

de Palma, F. ;

Digel, S. W. .

ASTROPHYSICAL JOURNAL LETTERS, 2009, 706 (01) :L138-L144

[3] Fermi Observations of High-Energy Gamma-Ray Emission from GRB 080916C [J].

Abdo, A. A. ;

Ackermann, M. ;

Arimoto, M. ;

Asano, K. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Band, D. L. ;

Barbiellini, G. ;

Baring, M. G. ;

Bastieri, D. ;

Battelino, M. ;

Baughman, B. M. ;

Bechtol, K. ;

Bellardi, F. ;

Bellazzini, R. ;

Berenji, B. ;

Bhat, P. N. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bogaert, G. ;

Bogart, J. R. ;

Bonamente, E. ;

Bonnell, J. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Briggs, M. S. ;

Brigida, M. ;

Bruel, P. ;

Burnett, T. H. ;

Burrows, D. ;

Busetto, G. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Casandjian, J. M. ;

Ceccanti, M. ;

Cecchi, C. ;

Celotti, A. ;

Charles, E. ;

Chekhtman, A. ;

Cheung, C. C. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. .

SCIENCE, 2009, 323 (5922) :1688-1693

[4] Particle acceleration by ultrarelativistic shocks: theory and simulations [J].

Achterberg, A ;

Gallant, YA ;

Kirk, JG ;

Guthmann, AW .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2001, 328 (02) :393-408

[5] DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A [J].

Ackermann, M. ;

Ajello, M. ;

Asano, K. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Baring, M. G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Bhat, P. N. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Briggs, M. S. ;

Brigida, M. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, O. ;

Chaplin, V. ;

Charles, E. ;

Chekhtman, A. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Connaughton, V. ;

Conrad, J. ;

Cutini, S. ;

Dermer, C. D. ;

De Angelis, A. ;

De Palma, F. ;

Dingus, B. L. ;

Silva, E. Do Couto E. ;

Drell, P. S. ;

Dubois, R. ;

Favuzzi, C. .

ASTROPHYSICAL JOURNAL, 2011, 729 (02)

[6] FERMI OBSERVATIONS OF GRB 090510: A SHORT-HARD GAMMA-RAY BURST WITH AN ADDITIONAL, HARD POWER-LAW COMPONENT FROM 10 keV TO GeV ENERGIES [J].

Ackermann, M. ;

Asano, K. ;

Atwood, W. B. ;

Axelsson, M. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Baring, M. G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Berenji, B. ;

Bhat, P. N. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bonamente, E. ;

Borgland, A. W. ;

Bouvier, A. ;

Bregeon, J. ;

Brez, A. ;

Briggs, M. S. ;

Brigida, M. ;

Bruel, P. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caraveo, P. A. ;

Carrigan, S. ;

Casandjian, J. M. ;

Cecchi, C. ;

Celik, Oe. ;

Charles, E. ;

Chiang, J. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Connaughton, V. ;

Conrad, J. ;

Dermer, C. D. ;

de Palma, F. ;

Dingus, B. L. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Dubois, R. ;

Dumora, D. ;

Farnier, C. ;

Favuzzi, C. ;

Fegan, S. J. ;

Finke, J. .

ASTROPHYSICAL JOURNAL, 2010, 716 (02) :1178-1190

[7]

[Anonymous], 2009, ARXIV09110349

[8]

Axford WI, 1977, Int. Cosmic Ray Conf, V11, P132

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

BELL, AR .

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

[10] Energy injection episodes in gamma-ray bursts:: The light curves and polarization properties of GRB 0210041 [J].

Björnsson, G ;

Gudmundsson, EH ;

Jóhannesson, G .

ASTROPHYSICAL JOURNAL, 2004, 615 (02) :L77-L80

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