Constraining models for the origin of ultra-high-energy cosmic rays with spectrum, composition, and arrival direction data measured at the Pierre Auger Observatory - INSPIRE

DataBETA

Constraining models for the origin of ultra-high-energy cosmic rays with spectrum, composition, and arrival direction data measured at the Pierre Auger Observatory

Pierre Auger

Collaboration

Jul 25, 2023

13 pages

Published in:

PoS ICRC2023 (2023) 258

Contribution to:

- ICRC2023
, 258

Published: Jul 25, 2023

DOI:

10.22323/1.444.0258

Experiments:

AUGER

reference search4 citations

Citations per year

Abstract: (SISSA)

The distribution of cosmic-ray arrival directions shows a better agreement with models in whicha fraction of the flux is associated with catalogs of nearby source candidates, such as starburstgalaxies, than with isotropy. To investigate this further, we use a novel approach, fitting simultaneouslythe energy spectrum, distributions of shower maxima, and arrival directions at the highestenergies measured with the Pierre Auger Observatory. The astrophysical model consists of homogeneouslydistributed background sources as well as an adaptable contribution from nearbysource candidates. Propagation effects and a rigidity-dependent magnetic field blurring are takeninto account, producing a rising level of anisotropy with the energy. We demonstrate that a modelcontaining a flux fraction of around 20% from the starburst galaxy catalog at 40 EeV, with a hard,nitrogen-dominated injection spectrum, provides a good description of the data. By investigatinga scenario with Cen A as a single source in combination with the homogeneous background, weshow that this region of the sky provides the dominant part to the observed anisotropy signal.Models based on jetted active galactic nuclei whose cosmic-ray flux scales with the gamma-rayemission are disfavored. The modeled energy evolution of the arrival directions, the spectra ofindividual sources, as well as the statistical significance of the results, including the influence ofexperimental systematic effects, will be discussed in this contribution.

cosmic radiation: UHE
cosmic radiation: flux
injection: spectrum
observatory
background
Auger
anisotropy
AGN
showers
magnetic field

References(15)

Figures(0)

[1]

An Indication of anisotropy in arrival directions of ultra-high-energy cosmic rays through comparison to the flux pattern of extragalactic gamma-ray sources

Pierre Auger

Collaboration

•

Alexander Aab
(
- Nijmegen U., IMAPP
)

et al.

- Astrophys.J.Lett. 853 (2018) 2, L29
•
e-Print:
- 1801.06160
•
DOI:
- 10.3847/2041-8213/aaa66d

[2]

Arrival Directions of Cosmic Rays above 32 EeV from Phase One of the Pierre Auger Observatory

Pierre Auger

Collaboration

•

Pedro Abreu
(
- LIP, Lisbon
)

et al.

- Astrophys.J. 935 (2022) 2, 170
•
e-Print:
- 2206.13492
•
DOI:
- 10.3847/1538-4357/ac7d4e

[3]

An update on the arrival direction studies made with data from the Pierre Auger Observatory

Pierre Auger

Collaboration

•

Adila Abdul Halim

et al.

- PoS ICRC2023 (2023) 252
•
DOI:
- 10.22323/1.444.0252

[4]

Combined fit of spectrum and composition data as measured by the Pierre Auger Observatory

Pierre Auger

Collaboration

•

Alexander Aab
(
- Nijmegen U., IMAPP
)

et al.

- JCAP 04 (2017) 038,
- JCAP 03 (2018) E02 (erratum)
•
e-Print:
- 1612.07155
•
DOI:
- 10.1088/1475-7516/2017/04/038

[5]

Constraining the sources of ultra-high-energy cosmic rays across and above the ankle with the spectrum and composition data measured at the Pierre Auger Observatory

Pierre Auger

Collaboration

•

A. Abdul Halim
(
- Adelaide U.
)

et al.

- JCAP 05 (2023) 024
•
e-Print:
- 2211.02857
•
DOI:
- 10.1088/1475-7516/2023/05/024

[6]

Measurement of the cosmic-ray energy spectrum above $2.5{\times} 10^{18}$ eV using the Pierre Auger Observatory

Pierre Auger

Collaboration

•

Alexander Aab
(
- Nijmegen U., IMAPP
)

et al.

- Phys.Rev.D 102 (2020) 6, 062005
•
e-Print:
- 2008.06486
•
DOI:
- 10.1103/PhysRevD.102.062005

[7]

Mass Composition of Cosmic Rays with Energies above 10 $^{17.2}$ eV from the Hybrid Data of the Pierre Auger Observatory

Pierre Auger

Collaboration

•

Alexey Yushkov
(
- Prague, Inst. Phys. and
- Pierre Auger Observ.
)

for the collaboration.

- PoS ICRC2019 (2020) 482
•
DOI:
- 10.22323/1.358.0482

[8]

A combined fit of energy spectrum, shower depth distribution and arrival directions to constrain astrophysical models of UHECR sources

Pierre Auger

Collaboration

•

Pedro Abreu

et al.

- PoS ICRC2021 (2021) 368
•
DOI:
- 10.22323/1.395.0368

[9]

Sensitivity of the combined fit of energy spectrum, shower depth distributions, and arrival directions at the Pierre Auger Observatory

Pierre Auger

Collaboration

•

Teresa Bister
(
- Nijmegen U., IMAPP and
- Aachen, Tech. Hochsch.
)

for the collaboration.

- EPJ Web Conf. 283 (2023) 03008
•
DOI:
- 10.1051/epjconf/202328303008

[10]

Constraining models for the origin of ultra-high-energy cosmic rays with a novel combined analysis of arrival directions, spectrum, and composition data measured at the Pierre Auger Observatory

Pierre Auger

Collaboration

•

A. Abdul Halim
(
- Adelaide U.
)

et al.

- JCAP 01 (2024) 022
•
e-Print:
- 2305.16693
•
DOI:
- 10.1088/1475-7516/2024/01/022

[11]

CRPropa 3 - a Public Astrophysical Simulation Framework for Propagating Extraterrestrial Ultra-High Energy Particles

et al.

- JCAP 05 (2016) 038
•
e-Print:
- 1603.07142
•
DOI:
- 10.1088/1475-7516/2016/05/038

[12]

Semi-analytic modeling of the EBL and consequences for extragalactic gamma-ray spectra

- Mon.Not.Roy.Astron.Soc. 422 (2012) 3189
•
e-Print:
- 1104.0671
•
DOI:
- 10.1111/j.1365-2966.2012.20841.x

[13]

Modern Nuclear Data Evaluation with the TALYS Code System

- Nucl.Data Sheets 113 (2012) 2841-2934
•
DOI:
- 10.1016/j.nds.2012.11.002

[14]

Reinterpreting the development of extensive air showers initiated by nuclei and photons

Manlio De Domenico
(
- INFN, Catania and
- Catania U., SSC and
- Catania U.
)
,
Mariangela Settimo
(
- Paris U., VI-VII
)
,
Simone Riggi
(
- INAF, Catania and
- Catania Astrophys. Observ.
)
,
Eric Bertin
(
- Lyon, Ecole Normale Superieure
)

- JCAP 07 (2013) 050
•
e-Print:
- 1305.2331
•
DOI:
- 10.1088/1475-7516/2013/07/050

[15]

The Pierre Auger Collaboration A. Abdul Halim13, P. Abreu72, M. Aglietta54

A. Zonca

- J.Open Source Softw. 4 (2019) 35