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Relevance of VHE blazar spectra models with axion-like particles

Hai-Jun Li
(
)

Dec 28, 2021

21 pages

Published in:

JCAP 02 (2022) 02, 025

Published: Feb 15, 2022

e-Print:

2112.14145 [astro-ph.HE]

DOI:

10.1088/1475-7516/2022/02/025

View in:

ADS Abstract Service

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Abstract: (IOP)

The oscillation of photons and axion-like particles (ALPs) in the astrophysical magnetic fields could modify the measured very high energy (VHE; ℰ ≳ 100 GeV) γ-ray spectra of the blazar sources. In this paper, we use the VHE γ-ray observations of the blazar Markarian 421 (Mrk 421) measured by MAGIC and Fermi-LAT in 2017 with four phases to constrain the ALP. We give the spectral energy distributions (SEDs) of these phases under the null and ALP hypotheses. We also test the effects of the γ-ray blazar intrinsic spectra models on the ALP constraints. No significant relationship is confirmed between the ALP constraints and the model selections. The 95% C.L. combined constraints set by the single-model and multi-model scenarios on the ALP parameter space are roughly at the photon-ALP coupling g

_{aγ}

≳ 3 × 10

^{-11}

GeV

^{-1}

for the ALP mass 1 × 10

^{-8}

eV ≲ m

_{a}

≲ 2 × 10

^{-7}

eV.

Note:

20 pages, 10 figures. Published in JCAP

active galactic nuclei
axions
galactic magnetic fields
gamma ray theory
Axion-Like Particles
Blazar Spectra
Gamma-ray
Mrk 421
blazar: spectrum
photon: oscillation

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