# ICRC 2021

12-23 July 2021
Online
Europe/Berlin timezone

## Transient Source for the Highest Energy Galactic Cosmic Rays

13 Jul 2021, 12:00
1h 30m
03

#### 03

Talk CRI | Cosmic Ray Indirect

### Speaker

Glennys Farrar (New York University)

### Description

We analyze the Auger dipole anisotropy measurements below 8 EeV, to expose the existence of an individual source of the Galactic cosmic rays above $10^{17}$ eV. The source is incompatible with being in the direction of the Galactic center by a $\chi^2$/dof > 6. Interpreting the amplitude and direction of the Galactic HE Dipole in terms of a transient, we find:
a) The amplitude of the Galactic VHE dipole constrains the ratio of source distance and time since the transient event occurred.
b) The Galactic VHE dipole is compatible with production in a transient event in the Galactic plane which occurred about 30 kyr ago at a distance of about 1 kpc. A SN remnant and pulsar consistent with being the relics of this event are identified.
c) The peak rigidity of these VHE Galactic CRs is about 0.1 EV.
d) For reasonable estimates of the diffusion coefficient of the GMF, the energy emitted in CRs above 100 PeV by the transient Galactic source is about $10^{44-45}$ ergs —compatible with acceleration in the converging-flow shock of a core-collapse supernova exploding into the wind of a massive binary companion.

The estimated rate of such events in the Galaxy as a whole is compatible with the inferred space-time separation of this event. Comparable transient events in galaxies throughout the Universe may be an important source of astrophysical neutrinos. Implications and tests of this hypothesis for the origin of the highest energy Galactic cosmic rays will be discussed.

### Keywords

Galactic Cosmic Rays;
Astrophysical Neutrinos;
Supernovae;
Massive Binaries;
Transients;
Particle Acceleration;
Composition;

Subcategory Theoretical Results

### Primary author

Glennys Farrar (New York University)

### Co-authors

Chen Ding (New York University)

### Presentation Materials

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