FERMI CONSTRAINS DARK-MATTER ORIGIN OF HIGH-ENERGY POSITRON ANOMALY

被引：4

作者：

Pohl, Martin ^{[1
,2
]}

Eichler, David ^{[3
]}

机构：

[1] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[2] DESY, D-15738 Zeuthen, Germany

[3] Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 712卷 / 01期

基金：

美国国家科学基金会;

关键词：

cosmic rays; dark matter; gamma rays: general; COSMIC-RAY POSITRONS; GAMMA-RAY; RADIATION; PARTICLES;

D O I：

10.1088/2041-8205/712/1/L53

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Fermi measurements of the high-latitude gamma-ray background strongly constrain a decaying-dark-matter origin for the 1-100 GeV Galactic positron anomaly measured with PAMELA. Inverse Compton scattering of the microwave background by the emergent positrons produces a bump in the diffuse 100-200 MeV gamma-ray background that would protrude from the observed background at these energies. The positrons are thus constrained to emerge from the decay process at a typical energy between similar to 100 GeV and similar to 250 GeV. By considering only.-ray emission of the excess positrons and electrons, we derive a minimum diffuse gamma-ray flux that, apart from the positron spectrum assumed, is independent of the actual decay modes. Any gamma-rays produced directly by the dark-matter decay leads to an additional signal that makes the observational limits more severe. A similar constraint on the energy of emergent positrons from annihilation in dark-matter substructures is argued to exist, according to recent estimates of enhancement in low-mass dark-matter substructures, and improved simulations of such substructure will further sharpen this constraint.

引用

页码：L53 / L57

页数：5

共 36 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]

ACKERMANN M, 2009, COMMUNICATION

[3] 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

[4] New Measurement of the Antiproton-to-Proton Flux Ratio up to 100 GeV in the Cosmic Radiation [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. ;

Fedele, D. ;

Galper, A. M. ;

Grishantseva, L. ;

Hofverberg, P. ;

Leonov, A. ;

Koldashov, S. V. ;

Krutkov, S. Y. ;

Kvashnin, A. N. ;

Malvezzi, V. ;

Marcelli, L. ;

Menn, W. ;

Mikhailov, V. V. ;

Minori, M. ;

Mocchiutti, E. ;

Nagni, M. ;

Orsi, S. ;

Osteria, G. ;

Papini, P. ;

Pearce, M. ;

Picozza, P. ;

Ricci, M. ;

Ricciarini, S. B. ;

Simon, M. ;

Sparvoli, R. ;

Spillantini, P. ;

Stozhkov, Y. I. ;

Taddei, E. ;

Vacchi, A. ;

Vannuccini, E. ;

Vasilyev, G. ;

Voronov, S. A. ;

Yurkin, Y. T. .

PHYSICAL REVIEW LETTERS, 2009, 102 (05)

[5] A theory of dark matter [J].

Arkani-Hamed, Nima ;

Finkbeiner, Douglas P. ;

Slatyer, Tracy R. ;

Weiner, Neal .

PHYSICAL REVIEW D, 2009, 79 (01)

[6] Decaying dark matter as a probe of unification and TeV spectroscopy [J].

Arvanitaki, Asimina ;

Dimopoulos, Savas ;

Dubovsky, Sergei ;

Graham, Peter W. ;

Harnik, Roni ;

Rajendran, Surjeet .

PHYSICAL REVIEW D, 2009, 80 (05)

[7] BREMSSTRAHLUNG, SYNCHROTRON RADIATION, AND COMPTON SCATTERING OF HIGH-ENERGY ELECTRONS TRAVERSING DILUTE GASES [J].

BLUMENTHAL, GR ;

GOULD, RJ .

REVIEWS OF MODERN PHYSICS, 1970, 42 (02) :237-+

[8] Gamma-ray constraints on hadronic and leptonic activities of decaying dark matter [J].

Chen, Chuan-Ren ;

Mandal, Sourav K. ;

Takahashi, Fuminobu .

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2010, (01)

[9]

Diemand J., 2007, APJ, V657, P252

[10] TEV PARTICLES AS WEAKLY UNSTABLE DARK MATTER [J].

EICHLER, D .

PHYSICAL REVIEW LETTERS, 1989, 63 (22) :2440-2442

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