Axion effects on gamma-ray spectral irregularities. II: Implications of EBL absorption
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866929718574448640 |
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| author | Li, Hai-Jun Chao, Wei Tan, Xiu-Hui Zhou, Yu-Feng |
| author_facet | Li, Hai-Jun Chao, Wei Tan, Xiu-Hui Zhou, Yu-Feng |
| contents | 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 $\{m_a, g_{aγ}\}$ plane are provided, showing similar distributions. For comparison, we define a new delta chi-square, $χ_d^2$, to quantify the difference in chi-square values. The distributions of $χ_d^2$ and the gamma-ray SEDs corresponding to the maximum delta chi-square, $χ^2_{d, \rm max}$, are also presented for comparison. Our results indicate that the influence of these different EBL models is non-dominant at the low-redshift gamma-ray axionscope. In these cases, choosing the latest model, Saldana-Lopez-21, is sufficient. However, as the redshift of the sources increases, this influence becomes more significant. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_14791 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Axion effects on gamma-ray spectral irregularities. II: Implications of EBL absorption Li, Hai-Jun Chao, Wei Tan, Xiu-Hui Zhou, Yu-Feng High Energy Physics - Phenomenology High Energy Astrophysical Phenomena 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 $\{m_a, g_{aγ}\}$ plane are provided, showing similar distributions. For comparison, we define a new delta chi-square, $χ_d^2$, to quantify the difference in chi-square values. The distributions of $χ_d^2$ and the gamma-ray SEDs corresponding to the maximum delta chi-square, $χ^2_{d, \rm max}$, are also presented for comparison. Our results indicate that the influence of these different EBL models is non-dominant at the low-redshift gamma-ray axionscope. In these cases, choosing the latest model, Saldana-Lopez-21, is sufficient. However, as the redshift of the sources increases, this influence becomes more significant. |
| title | Axion effects on gamma-ray spectral irregularities. II: Implications of EBL absorption |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2410.14791 |