The Large-scale Anisotropy and Flux (de)magnification of Ultrahigh-energy Cosmic Rays in the Galactic Magnetic Field

被引：0
|
作者：
Bister, Teresa [1 ,2 ]
Farrar, Glennys R. [3 ]
Unger, Michael [4 ,5 ]
机构：
[1] Radboud Univ Nijmegen, Inst Math Astrophys & Particle Phys, Nijmegen, Netherlands
[2] Natl Inst Subatomaire Fys NIKHEF, Sci Pk, Amsterdam, Netherlands
[3] NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA
[4] Karlsruhe Inst Technol KIT, Inst Astroparticle Phys, Karlsruhe, Germany
[5] Norwegian Univ Sci & Technol NTNU, Inst Fysikk, Trondheim, Norway
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2024年 / 975卷 / 01期
基金：
美国国家科学基金会;
关键词：
LUMINOSITY FUNCTION; ARRIVAL DIRECTIONS; EVOLUTION; GALAXIES; EEV;
D O I：
10.3847/2041-8213/ad856f
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We calculate the arrival direction distribution of ultrahigh-energy cosmic rays (UHECRs) with a new suite of models of the Galactic magnetic field (GMF), assuming sources follow the large-scale structure of the Universe. Compared to previous GMF models, the amplitude of the dipole component of the UHECR arrival flux is significantly reduced. We find that the reduction is due to the accidentally coinciding position of the peak of the extragalactic UHECR flux and the boundary of strong flux demagnification due to the GMF toward the central region of the Galaxy. This serendipitous sensitivity of UHECR anisotropies to the GMF model will be a powerful probe of the source distribution as well as Galactic and extragalactic magnetic fields. Demagnification by the GMF also impacts the visibility of some popular source candidates.
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页数：12
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