Spectral Breaks as a Signature of Cosmic Ray Induced Turbulence in the Galaxy

被引：220

作者：

Blasi, Pasquale ^{[1
,3
]}

Amato, Elena ^{[3
]}

Serpico, Pasquale D. ^{[2
]}

机构：

[1] INFN Lab Nazl Gran Sasso, Assergi, Italy

[2] Univ Savoie, CNRS, LAPTh, F-74941 Annecy Le Vieux, France

[3] INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 06期

关键词：

SUPERNOVA-REMNANTS; CONFINEMENT; DISSIPATION; DIFFUSION; ORIGIN; WAVES;

D O I：

10.1103/PhysRevLett.109.061101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the complex shape of the cosmic ray (CR) spectrum, as recently measured by PAMELA and inferred from Fermi-LAT gamma-ray observations of molecular clouds in the Gould belt, can be naturally understood in terms of basic plasma astrophysics phenomena. A break from a harder to a softer spectrum at rigidity R similar or equal to 10 GV follows from a transition from transport dominated by advection of particles with Alfven waves to a regime where diffusion in the turbulence generated by the same CRs is dominant. A second break at R similar or equal to 200 GV happens when the diffusive propagation is no longer determined by the self-generated turbulence, but rather by the cascading of externally generated turbulence (for instance due to supernova bubbles) from large spatial scales to smaller scales where CRs can resonate. Implications of this scenario for the cosmic ray spectrum, grammage, and anisotropy are discussed.

引用

页数：5

共 20 条

[1] PAMELA Measurements of Cosmic-Ray Proton and Helium Spectra [J].

Adriani, O. ;

Barbarino, G. C. ;

Bazilevskaya, G. A. ;

Bellotti, R. ;

Boezio, M. ;

Bogomolov, E. A. ;

Bonechi, L. ;

Bongi, M. ;

Bonvicini, V. ;

Borisov, S. ;

Bottai, S. ;

Bruno, A. ;

Cafagna, F. ;

Campana, D. ;

Carbone, R. ;

Carlson, P. ;

Casolino, M. ;

Castellini, G. ;

Consiglio, L. ;

De Pascale, M. P. ;

De Santis, C. ;

De Simone, N. ;

Di Felice, V. ;

Galper, A. M. ;

Gillard, W. ;

Grishantseva, L. ;

Jerse, G. ;

Karelin, A. V. ;

Koldashov, S. V. ;

Krutkov, S. Y. ;

Kvashnin, A. N. ;

Leonov, A. ;

Malakhov, V. ;

Malvezzi, V. ;

Marcelli, L. ;

Mayorov, A. G. ;

Menn, W. ;

Mikhailov, V. V. ;

Mocchiutti, E. ;

Monaco, A. ;

Mori, N. ;

Nikonov, N. ;

Osteria, G. ;

Palma, F. ;

Papini, P. ;

Pearce, M. ;

Picozza, P. ;

Pizzolotto, C. ;

Ricci, M. ;

Ricciarini, S. B. .

SCIENCE, 2011, 332 (6025) :69-72

[2] DISCREPANT HARDENING OBSERVED IN COSMIC-RAY ELEMENTAL SPECTRA [J].

Ahn, H. S. ;

Allison, P. ;

Bagliesi, M. G. ;

Beatty, J. J. ;

Bigongiari, G. ;

Childers, J. T. ;

Conklin, N. B. ;

Coutu, S. ;

DuVernois, M. A. ;

Ganel, O. ;

Han, J. H. ;

Jeon, J. A. ;

Kim, K. C. ;

Lee, M. H. ;

Lutz, L. ;

Maestro, P. ;

Malinin, A. ;

Marrocchesi, P. S. ;

Minnick, S. ;

Mognet, S. I. ;

Nam, J. ;

Nam, S. ;

Nutter, S. L. ;

Park, I. H. ;

Park, N. H. ;

Seo, E. S. ;

Sina, R. ;

Wu, J. ;

Yang, J. ;

Yoon, Y. S. ;

Zei, R. ;

Zinn, S. Y. .

ASTROPHYSICAL JOURNAL LETTERS, 2010, 714 (01) :L89-L93

[3] ELECTRON-DENSITY POWER SPECTRUM IN THE LOCAL INTERSTELLAR-MEDIUM [J].

ARMSTRONG, JW ;

RICKETT, BJ ;

SPANGLER, SR .

ASTROPHYSICAL JOURNAL, 1995, 443 (01) :209-221

[4]

Blasi P., 2012, J COSMOL ASTROPART P, V01

[5] Diffusive propagation of cosmic rays from supernova remnants in the Galaxy. II: anisotropy [J].

Blasi, Pasquale ;

Amato, Elena .

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2012, (01)

[6] COSMIC-RAY CONFINEMENT IN THE GALAXY [J].

CESARSKY, CJ .

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, 1980, 18 :289-319

[7]

Dopita M.A., 2002, ASTROPHYSICS DIFFUSE, DOI 10.1007/978-3-662-05866-4.

[8] CONFINEMENT OF GALACTIC COSMIC-RAYS BY ALFVEN WAVES [J].

HOLMES, JA .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1975, 170 (02) :251-260

[9]

Kachelriess M., ARXIV12064705

[10] Low-Energy Break in the Spectrum of Galactic Cosmic Rays [J].

Neronov, A. ;

Semikoz, D. V. ;

Taylor, A. M. .

PHYSICAL REVIEW LETTERS, 2012, 108 (05)

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