Escape of Cosmic Rays from the Galaxy and Effects on the Circumgalactic Medium

被引：27

作者：

Blasi, Pasquale ^{[1
,2
]}

Amato, Elena ^{[3
,4
]}

机构：

[1] Gran Sasso Sci Inst, Viale F Crispi 7, I-67100 Laquila, Italy

[2] INFN, Lab Nazl Gran Sasso, Via G Acitelli 22, Assergi, AQ, Italy

[3] Osserv Astrofis Arcetri, INAF, Largo E Fermi 5, I-50125 Florence, Italy

[4] Univ Firenze, Dipartimento Fis & Astron, Via Sansone 1, I-50019 Sesto Fiorentino, FI, Italy

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 05期

关键词：

MAGNETIC-FIELD; AMPLIFICATION; PROPAGATION;

D O I：

10.1103/PhysRevLett.122.051101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The escape of cosmic rays from the Galaxy is expected to shape their spectrum inside the Galaxy. Yet, this phenomenon is very poorly understood and, in the absence of a physical description, it is usually modeled as a free escape from a given boundary, typically located at a few kiloparsec distance from the Galactic disc. We show that the assumption of free escape leads to the conclusion that the cosmic ray current propagating in the circumgalactic medium is responsible for a nonresonant cosmic ray induced instability that in turn leads to the generation of a magnetic field of strength similar to 2 x 10(-8) G on a scale similar to 10 kpc around our Galaxy. The self-generated diffusion produces large gradients in the particle pressure that induce a displacement of the intergalactic medium with velocity similar to 10-100 km/s. Cosmic rays are then carried away by advection. If the overdensity of the intergalactic gas in a region of size similar to 10 kpc around our Galaxy is greater than or similar to 100 with respect to the cosmological baryon density Omega(b)rho(cr), then the flux of high energy neutrinos due to pion production becomes comparable with the flux of astrophysical neutrinos recently measured by IceCube.

引用

页数：5

共 18 条

[1] A COMBINED MAXIMUM-LIKELIHOOD ANALYSIS OF THE HIGH-ENERGY ASTROPHYSICAL NEUTRINO FLUX MEASURED WITH ICECUBE [J].

Aartsen, M. G. ;

Abraham, K. ;

Ackermann, M. ;

Adams, J. ;

Aguilar, J. A. ;

Ahlers, M. ;

Ahrens, M. ;

Altmann, D. ;

Anderson, T. ;

Archinger, M. ;

Arguelles, C. ;

Arlen, T. C. ;

Auffenberg, J. ;

Bai, X. ;

Barwick, S. W. ;

Baum, V. ;

Bay, R. ;

Beatty, J. J. ;

Tjus, J. Becker ;

Becker, K. -H. ;

Beiser, E. ;

BenZvi, S. ;

Berghaus, P. ;

Berley, D. ;

Bernardini, E. ;

Bernhard, A. ;

Besson, D. Z. ;

Binder, G. ;

Bindig, D. ;

Bissok, M. ;

Blaufuss, E. ;

Blumenthal, J. ;

Boersma, D. J. ;

Bohm, C. ;

Boerner, M. ;

Bos, F. ;

Bose, D. ;

Boeser, S. ;

Botner, O. ;

Braun, J. ;

Brayeur, L. ;

Bretz, H. -P. ;

Brown, A. M. ;

Buzinsky, N. ;

Casey, J. ;

Casier, M. ;

Cheung, E. ;

Chirkin, D. ;

Christov, A. ;

Christy, B. .

ASTROPHYSICAL JOURNAL, 2015, 809 (01)

[2] Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector [J].

Aartsen, M. G. ;

Abbasi, R. ;

Abdou, Y. ;

Ackermann, M. ;

Adams, J. ;

Aguitar, J. A. ;

Alders, M. ;

Altmann, D. ;

Auffenberg, J. ;

Ba, X. ;

Baker, M. ;

Barwick, S. W. ;

Baum, V. ;

Bay, R. ;

Beatty, J. J. ;

Bechet, S. ;

Tjus, J. Becker ;

Becker, K-H. ;

Benabderrahmane, M. L. ;

BenZvi, S. ;

Berghaus, P. ;

Berley, D. ;

Bernardini, E. ;

Bernhard, A. ;

Bertrand, D. ;

Besson, D. Z. ;

Binder, G. ;

Bindig, D. ;

Bissok, M. ;

Blaufuss, E. ;

Blumenthal, J. ;

Boersma, D. J. ;

Boliaichuk, S. ;

Bohm, C. ;

Bose, D. ;

Boeser, S. ;

Botner, O. ;

Brayeur, L. ;

Bretz, H-P. ;

Brown, A. M. ;

Bruijn, R. ;

Brunner, J. ;

Carson, M. ;

Casey, J. ;

Casier, M. ;

Chirkin, D. ;

Christov, A. ;

Christy, B. ;

Clark, K. ;

Cleverrnann, F. .

SCIENCE, 2013, 342 (6161) :947-+

[3] THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV [J].

Ackermann, M. ;

Ajello, M. ;

Albert, A. ;

Atwood, W. B. ;

Baldini, L. ;

Ballet, J. ;

Barbiellini, G. ;

Bastieri, D. ;

Bechtol, K. ;

Bellazzini, R. ;

Bissaldi, E. ;

Blandford, R. D. ;

Bloom, E. D. ;

Bottacini, E. ;

Brandt, T. J. ;

Bregeon, J. ;

Bruel, P. ;

Buehler, R. ;

Buson, S. ;

Caliandro, G. A. ;

Cameron, R. A. ;

Caragiulo, M. ;

Caraveo, P. A. ;

Cavazzuti, E. ;

Cecchi, C. ;

Charles, E. ;

Chekhtman, A. ;

Chiang, J. ;

Chiaro, G. ;

Ciprini, S. ;

Claus, R. ;

Cohen-Tanugi, J. ;

Conrad, J. ;

Cuoco, A. ;

Cutini, S. ;

D'Ammando, F. ;

de Angelis, A. ;

de Palma, F. ;

Dermer, C. D. ;

Digel, S. W. ;

do Couto e Silva, E. ;

Drell, P. S. ;

Favuzzi, C. ;

Ferrara, E. C. ;

Focke, W. B. ;

Franckowiak, A. ;

Fukazawa, Y. ;

Funk, S. ;

Fusco, P. ;

Gargano, F. .

ASTROPHYSICAL JOURNAL, 2015, 799 (01)

[4] Turbulent amplification of magnetic field and diffusive shock acceleration of cosmic rays [J].

Bell, AR .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 353 (02) :550-558

[5]

Berezinskii V. S., 1984, ASTROFIZIKA KOSMICHE, P360

[6] High-Energy Cosmic Ray Self-Confinement Close to Extra-Galactic Sources [J].

Blasi, Pasquale ;

Amato, Elena ;

D'Angelo, Marta .

PHYSICAL REVIEW LETTERS, 2015, 115 (12)

[7] On the cosmic ray spectrum from type II supernovae expanding in their red giant presupernova wind [J].

Cardillo, Martina ;

Amato, Elena ;

Blasi, Pasquale .

ASTROPARTICLE PHYSICS, 2015, 69 :1-10

[8] Origin of the Cosmic Ray Galactic Halo Driven by Advected Turbulence and Self-Generated Waves [J].

Evoli, Carmelo ;

Blasi, Pasquale ;

Morlino, Giovanni ;

Aloisio, Roberto .

PHYSICAL REVIEW LETTERS, 2018, 121 (02)

[9] The interstellar environment of our galaxy [J].

Ferrière, KM .

REVIEWS OF MODERN PHYSICS, 2001, 73 (04) :1031-1066

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

HOLMES, JA .

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

← 1 2 →