Axion effects on gamma-ray spectral irregularities. II: Implications of EBL absorption

IF 4.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Hai-Jun Li , Wei Chao , Xiu-Hui Tan , Yu-Feng Zhou
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引用次数: 0

Abstract

The extragalactic background light (EBL) plays a crucial role in the propagation of high-energy particles throughout the Universe. In this work, we explore the impact of the EBL absorption effect on photon to axionlike particle (ALP) conversions from the very-high-energy gamma-ray spectral irregularities. For our purpose, we select four BL Lac blazars: Markarian 501, 1ES 0229+200, PKS 0301-243, and PKS 0447-439 for analysis. Their redshifts range from approximately 0.03 to 0.34. We first discuss the EBL absorption effect on the gamma-ray spectral energy distributions (SEDs) using three common EBL spectral models: Finke-10, Franceschini-17, and Saldana-Lopez-21. Then we consider the photon-ALP conversions in astrophysical magnetic fields. The best-fit chi-square distributions of these EBL models under the ALP assumption in the ALP parameter {ma,gaγ} plane are provided, showing similar distributions. For comparison, we define a new delta chi-square, χd2, to quantify the difference in chi-square values. The distributions of χd2 and the gamma-ray SEDs corresponding to the maximum delta chi-square, χd,max2, are also presented for comparison. Our results indicate that the influence of these different EBL spectral models is non-dominant at the low-redshift gamma-ray axionscope. In these cases, choosing the latest EBL model, Saldana-Lopez-21, is sufficient. However, as the redshift of the sources increases, this influence becomes more significant.
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来源期刊
Physics Letters B
Physics Letters B 物理-物理:综合
CiteScore
9.10
自引率
6.80%
发文量
647
审稿时长
3 months
期刊介绍: Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.
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