Implications of a possible clustering of highest energy cosmic rays

Very recently, a possible clustering of a subset of observed ultrahigh energy cosmic rays above about 40EeV (4x10~19eV) in pairs near the supergalactic plane was reported. We show that a confirmation of this effect would provide information on origin and nature of these events and, in case of charged primaries, imply interesting constraints on the extragalactic magnetic field. The observed time correlation would most likely rule out an association of these events with cosmological gamma ray bursts. If no prominent astrophysical source candidates such as powerful radiogalaxies can be found, the existence of a mechanism involving new fundamental physics would be favored.

Note:

10 latex pages, 1 postscript figure, uses aaspp4.sty, submitted to Astrophysical Journal Letters Report-no: FERMILAB-Pub-96/121-A

cosmic radiation: primary
photon: cosmic radiation
cosmic radiation: energy spectrum
energy spectrum: cosmic radiation
cosmic radiation: particle source
cosmic radiation: cluster
cosmological model
magnetic field
interpretation of experiments

References(39)

Figures(0)

Grand unified theories, topological defects and ultrahigh-energy cosmic rays

Pijushpani Bhattacharjee
(
- Chicago U., Astron. Astrophys. Ctr. and
- Chicago U., EFI
)
,
Christopher T. Hill
(
- Fermilab
)
,
David N. Schramm
(
)

- Phys.Rev.Lett. 69 (1992) 567-570,
•
DOI:
- 10.1103/PhysRevLett.69.567

Ultrahigh-energy Particle Flux From Cosmic Strings

Pijushpani Bhattacharjee
(
)
,
N.C. Rana
(
- Tata Inst.
)

- Phys.Lett.B 246 (1990) 365-370
•
DOI:
- 10.1016/0370-2693(90)90615-D

Monopole annihilation and highest energy cosmic rays

- Phys.Rev.D 51 (1995) 4079-4091
•
e-Print:
- astro-ph/9412053
•
DOI:
- 10.1103/PhysRevD.51.4079

Evidence for correlated changes in the spectrum and composition of cosmic rays at extremely high-energies

HiRes

Collaboration

•

D.J. Bird

et al.

- Phys.Rev.Lett. 71 (1993) 3401-3404
•
DOI:
- 10.1103/PhysRevLett.71.3401

The Cosmic ray energy spectrum observed by the Fly's Eye

HiRes

Collaboration

•

D.J. Bird
(
- Illinois U., Urbana and
- Utah U. and
- Adelaide U.
)

et al.

- Astrophys.J. 424 (1994) 491-502
•
DOI:
- 10.1086/173906

Detection of a cosmic ray with measured energy well beyond the expected spectral cutoff due to cosmic microwave radiation

HIRES

Collaboration

•

D.J. Bird
(
- Illinois U., Urbana and
- Utah U.
)

et al.

- Astrophys.J. 441 (1995) 144-150
•
e-Print:
- astro-ph/9410067
•
DOI:
- 10.1086/175344

Particle Acceleration at Astrophysical Shocks: A Theory of Cosmic Ray Origin

R. Blandford
(
- Caltech
)
,
D. Eichler
(
- Maryland U. and
- Ben Gurion U. of Negev
)

- Phys.Rept. 154 (1987) 1-75
•
DOI:
- 10.1016/0370-1573(87)90134-7

The Distribution of cosmological gamma-ray bursts

Ehud Cohen
(
- Hebrew U.
)
,
Tsvi Piran
(
- Hebrew U.
)

- Astrophys.J.Lett. 444 (1995) L25
•
e-Print:
- astro-ph/9502001
•
DOI:
- 10.1086/187851

Summary of the workshop

J.W. Cronin
(
- Paris U., VI-VII
)

- Nucl.Phys.B Proc.Suppl. 28 (1992) 213-226,
- Nucl. Phys. B, Proc. Suppl. 28B (1992) 213-226,
- In *Paris 1992, Proceedings, Cosmic rays above 10**19 eV - 1992* 213-226
•
DOI:
- 10.1016/0920-5632(92)90134-E

- Astrophys.J. 441 270

In search of a source for the 320 EeV Fly's Eye cosmic ray

Jerome W. Elbert
(
- Utah U.
)
,
Paul Sommers
(
- Utah U.
)

- Astrophys.J. 441 (1995) 151-161
•
e-Print:
- astro-ph/9410069
•
DOI:
- 10.1086/175345

- Astrophys.J. 217 L9

Gamma-ray bursts

- Ann.Rev.Astron.Astrophys. 33 (1995) 415-458
•
DOI:
- 10.1146/annurev.aa.33.090195.002215

End to the cosmic ray spectrum?

Kenneth Greisen
(
- Cornell U., LNS
)

- Phys.Rev.Lett. 16 (1966) 748-750
•
DOI:
- 10.1103/PhysRevLett.16.748

The highest energy cosmic ray

F. Halzen
(
- Wisconsin U., Madison
)
,
R.A. Vazquez
(
- Wisconsin U., Madison
)
,
T. Stanev
(
- Delaware U., Bartol Inst.
)
,
H.P. Vankov
(
- Delaware U., Bartol Inst.
)

- Astropart.Phys. 3 (1995) 151-156,
•
DOI:
- 10.1016/0927-6505(94)00038-5

Observation of a very energetic cosmic ray well beyond the predicted 2.7-K cutoff in the primary energy spectrum

et al.

- Phys.Rev.Lett. 73 (1994) 3491-3494
•
DOI:
- 10.1103/PhysRevLett.73.3491

Monopolonium

Christopher T. Hill
(
- Fermilab
)

- Nucl.Phys.B 224 (1983) 469-490
•
DOI:
- 10.1016/0550-3213(83)90386-3

The Origin of Ultrahigh-Energy Cosmic Rays

A.M. Hillas
(
- Leeds U.
)

- Ann.Rev.Astron.Astrophys. 22 (1984) 425-444,
- In *Burbidge, G. ( Ed.) Et Al.: Annual Review Of Astronomy and Astrophysics, Vol. 22*, 425-444,
- In *Lamb, F.k. ( Ed.): High Energy Astrophysics*, 277-296
•
DOI:
- 10.1146/annurev.aa.22.090184.002233