Cen A as the source of ultrahigh energy cosmic rays

Details Cen A as the source of ultrahigh energy cosmic rays Cen A as the source of ultrahigh energy cosmic rays

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..586..850p&link_type=abstract

RELATIVISTIC ASTROPHYSICS: 20th Texas Symposium. AIP Conference Proceedings, Volume 586, pp. 850-855 (2001).

Astronomy and Astrophysics

Astrophysics

2

Radio Galaxies, Cosmic Rays, Gamma-Ray Sources, Gamma-Ray Bursts, Electric And Magnetic Fields

Scientific paper

We argue from observed features of ultrahigh energy cosmic rays that whatever mechanism produces the events above the GZK energy, ~1019.7 eV, must also account for events down to ~1018.7 eV, including their isotropy and spectral smoothness. This rules out distributed sources such as topological defects and Z-bursts, and GRBs. We are lead to identify the powerful radio galaxy Cen A, at 3.4 Mpc, as a probable source of most ultrahigh energy CRs observed at Earth today, and to estimate the extragalactic magnetic field to be ~0.3 μG. .

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