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Implications of Recent UHECR Data for Multi-Messenger Studies of Cosmic Accelerators

Implications of Recent UHECR Data for Multi-Messenger Studies of Cosmic Accelerators. Vasiliki Pavlidou University of Chicago. g. g. p. g. g. g. g. g. g. n. n. g. g. g. g. g. Why multi-messenger?. In Context: High-Energy Observations in the Next Decade.

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Implications of Recent UHECR Data for Multi-Messenger Studies of Cosmic Accelerators

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  1. Implications of Recent UHECR Data for Multi-Messenger Studies of Cosmic Accelerators Vasiliki PavlidouUniversity of Chicago

  2. g g p g g g g g g n n g g g g g Why multi-messenger?

  3. In Context:High-Energy Observations in the Next Decade • GLAST: continuous full-sky coverage in GeV gamma rays • Ground-based TeV telescopes (CTA/AGIS/HAWC):full sky accessible in TeV gamma rays, high angular resolution • Neutrino telescopes (IceCube,KM3NeT): continuous full-sky coverage in TeV neutrinos • Auger South + North: continuous full-sky coverage in UHECRs (+ photons, neutrinos) • Auxiliary: radio, IR, optical, UV, X-ray • Perks: LIGO, LISA

  4. UHECR astronomy: some questions • What makes the highest-energy particles in the universe? • progress from lower energies, different messengers? • progress from theory? • Hadron vs lepton acceleration • progress with gamma-rays? • progress with neutrinos? • Particle energy spectrum at source • progress with extrapolation? some of the expected unique UHECR contributions to the multi-messenger picturenow: add some UHECR datarefine the puzzles

  5. Cen A AGN The UHECR Sky

  6. Source identification at the single-event-per-source limit • Correlation with AGN AGN are the sources • What are the sources? • How do we find them at the one-event-per-source limit? • Need multiple candidate source catalogs • Good southern sky coverage, complete, homogeneous (selected by physical property), with redshifts! • What kind of catalogs? • By object type (e.g., starburst galaxies, BL Lacs, galaxy clusters, Seyferts, radio-loud AGN …) • By likely counterpart emission (gamma-ray sources, radio sources, neutrino sources…) • Statistics of selection • Need at the same time less sky coverage, more hits

  7. V The UHECR Sky

  8. Where is the Virgo Cluster? • Is deficit of events significant? • Assuming the effect is real, what may be going on here? • Source ecology • Confinement • Propagation

  9. Cen A doublet doublet doublet doublet The UHECR Sky When should we expect the first UHECR source catalogue?

  10. Complications specific to cosmic-ray astronomy • Background • At highest energies: no cosmological background • Highest-E CR distribution anisotropic - sources cluster • Non-trivial to decide what expectations for events are if you take away one single source in a region with many candidate sources • Source density key • Point Spread Function • Not a function of the instrument, B-field dependent, largely unknown • Different for different parts of the sky

  11. The inverse multi-messenger problem • What are the doublets telling us? • We have 4 sources correlated with 8 events within 3.2 degrees. • Data collected with the equivalent of ~ 1 year of full-Auger exposure • Auger south ~ complete • if real sources, in 1yr we should have 8±3 events from them • Attack most-promising objects with multi-messenger campaigns • Complications • If sources are bursting rather than steady, we are stuck with studying sources in quiescence due to time spreads

  12. Outlook • UHECR Astronomy • Identification of source population at the 1-event-per-source limit -> homogeneous, complete, property selected catalogs of candidate sources • Within ~ 1 year: Is there a Virgo problem? What are the most likely southern sky sources? (triplets) • Statistically significant detection of point sources, spectra: challenging, need much better statistics, Auger North • In another year: meaningful constraints on source density, we will know how long we have to wait

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