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The origin and composition of Ultra-High Energy Cosmic Ray Events (UHECRs)are under debate. Here we improve constraints on the source population(s) andcompositions of UHECRs by accounting for UHECR deflections within existingGalactic magnetic field models (GMFs). We used Monte Carlo simulations forUHECRs detected by the Pierre Auger Observatory and AGASA in order to determinetheir outside-the-Galaxy arrival directions, and compared these with Galacticand extragalactic sources. The simulations, which used UHECR compositions fromprotons to Iron and seven models of the ordered GMF, include uncertainties inthe GMF and a turbulent magnetic field. The correlation between UHECRs andnearby extended radiogalaxies (Nagar & Matulich 2008) remains valid, evenstrengthened, within several GMF models. Both the nearest radiogalaxy CenA, andthe nearest radio-extended BL Lac, CGCG 413-019, are likely sources of multipleUHECRs. The correlation appears to be linked to the presence of the extendedradio source rather than a tracer of an underlying population. It is possible,but unlikely, that all UHECRs originate in the nearby radiogalaxy CenA. Forlight UHECRs about a third of UHECRs can be "matched" to nearby galaxies withextended radio jets. The remaining UHECRs could also be explained asoriginating in extended radiogalaxies if one has at least one of: a large UHECRmean free path, a high cluster and/or intergalactic magnetic field, a heavycomposition for two-thirds of the detected UHECRs. Several UHECRs havetrajectories which pass close to Galactic magnetars and/or microquasars.  If extended radiogalaxies are, or trace, UHECR sources, the most consistentmodels for the ordered GMF are the BS-S and BS-A models; the GMF models of Sunet al. 2008 are acceptable if a dipole component is added.

astronomy and astrophysics

Ultra-High Energy Cosmic Rays Detected by Auger and AGASA:Corrections  for Galactic Magnetic Field Deflections, Source Populations, and Arguments  for Multiple-Components