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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-6401
DTSTART:20210415T193000Z
DTEND:20210415T203000Z
DTSTAMP:20260414T233910Z
LAST-MODIFIED:20210412T144505Z
LOCATION:https://uwmadison.zoom.us/j/94502540064?pwd=c3p5ZmJuaGIzNDlsd
 G1Kc05CaVB6QT09
SUMMARY:Ultra-high-energy cosmic rays and neutrinos\, expectations for
  diffuse fluxes and arrival-direction correlations\, NPAC (Nuclear/Par
 ticle/Astro/Cosmo) Forum\, Arjen van Vliet\, DESY Zeuthen\, Germany
DESCRIPTION:Astrophysical neutrinos can be produced by cosmic-ray inte
 ractions\, either inside the sources of cosmic rays (source neutrinos)
  or during the propagation through extragalactic space (cosmogenic neu
 trinos). The expected cosmogenic neutrino flux in the EeV range depend
 s strongly on the composition of ultra-high-energy cosmic rays (UHECRs
 ). A larger fraction of protons will especially increase the expected 
 cosmogenic neutrino flux. One scenario in which a significant proton f
 raction can be expected is if different classes of Active Galactic Nuc
 lei (AGN) are the dominant sources of UHECRs. If that is the case\, no
 t only a large cosmogenic neutrino flux is expected\, but a large sour
 ce neutrino flux as well. It might therefore be interesting to look at
  correlations between neutrino and UHECR arrival directions. However\,
  deflections of UHECRs in magnetic fields decrease the expected direct
 ional correlations. Even for the weakest extragalactic magnetic fields
  (EGMFs) the non-observation of high-energy neutrino multiplets strong
 ly constrains the possibility to find neutrino-UHECR correlations. On 
 the other hand\, the Pierre Auger Collaboration has recently found ind
 ications for correlations between UHECR arrival directions and local s
 tar-forming galaxies or AGN. These results can be used to put limits o
 n the EGMFs between these galaxies and the Milky Way. For a source den
 sity of star-forming galaxies relatively strong EGMFs are required to 
 reproduce the level of anisotropy that Auger has observed. <br>
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URL:https://www.physics.wisc.edu/events/?id=6401
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