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Evidence for a connection between the gamma-ray and the highest energy cosmic-ray emissions by BL Lacertae objects

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arxiv astro-ph/0204360 v2 pith:DEOL57OQ submitted 2002-04-22 astro-ph hep-ph

classification astro-phhep-ph
keywords objectsgamma-rayarrivalcapablecatalogsconnectioncorrelatecosmic
verification ladder T0 review T1 audit T2 compute T3 formal
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A set of potentially gamma-ray--loud BL Lac objects is selected by intersecting the EGRET and BL Lac catalogs. Of the resulting 14 objects, eight are found to correlate with arrival directions of ultra--high-energy cosmic rays (UHECRs), with significance of the order of 5 sigma. This suggests that gamma-ray emission can be used as a distinctive feature of those BL Lac objects that are capable of producing UHECR.

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