ICRC2015

July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

The Possible Extragalactic Source of Ultra-High-Energy Cosmic Rays at the Telescope Array Hotspot

Jul 30, 2015, 3:15 PM
15m
World Forum Theater (World Forum)

World Forum Theater

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution CR-EX

Speaker

Dr Haoning He (UCLA)

Description

The Telescope Array (TA) collaboration has reported a hotspot, a cluster of 19 cosmic ray events with energies above $57~\rm EeV$ in a circle of $20^\circ$ radius centered at ${\rm R.A.}(\alpha)=146.^\circ7$, ${\rm Dec.}(\delta)=43.^\circ2$. We explore the hypothesis that the hotspot could originate from a single source. By considering the energy dependent deflections that are expected to affect arrival directions of cosmic rays propagating in cosmic magnetic fields, we identify the nearby starburst galaxy M82 and the bright nearby blazar Mrk 180 as two likely candidates. We discuss prospects of discriminating between the candidate sources with current and future spectral data.
Collaboration -- not specified -- 649

Primary author

Dr Haoning He (UCLA)

Co-authors

Alexander Kusenko (UCLA) Dr Ruizhi Yang (MPIK, Germany) Dr Shigehiro NAGATAKI (Riken) Dr Yizhong Fan (Purple Mountain Observatory, China)

Presentation materials

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