Constraints on axionlike particles from a combined analysis of three flaring $\text{Fermi}$ flat-spectrum radio quasars

Abstract

Many theories beyond the Standard Model of particle physics predict the existence of axionlike particles (ALPs) that mix with photons in the presence of a magnetic field. Searching for the effects of ALP-photon mixing in gamma-ray observations of blazars has provided some of the strongest constraints on ALP parameter space so far. Previously, only individual sources have been analysed. We perform a combined analysis on $\text{Fermi}$ Large Area Telescope data of three bright, flaring flat-spectrum radio quasars, with the blazar jets themselves as the dominant mixing region. For the first time, we include a full treatment of photon-photon dispersion within the jet, and account for the uncertainty in our B-field model by leaving the field strength free in the fitting. Overall, we find no evidence for ALPs, but are able to exclude the ALP parameters $m_a\lesssim 200$ neV and $g_{a\gamma }\gtrsim 5\times 10^{-12}$ GeV${}^{-1}$ with 95\% confidence.

18 pages, 14 figures; published Physical Review D; matches published version

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• Constraints on Axion-like Particles from the gamma-ray observation of the Galactic Center
• Active galactic nuclei through the prism of galaxy clusters: bounds on axion-like particles
• Constraints on Axion-Like Particles from VERITAS Observations of a Flaring Radio Galaxy in the Perseus Cluster
• An attempt to study axion-photon coupling using compact binary systems with high Shapiro time delay
• X-ray polarimetric features of Gamma-ray Bursts across varied redshifts and hints for Axion-Like-Particles
• Constraints on axionlike particles from 16.5 years of Fermi-LAT data and prospects for VLAST
• Characterizing Binary Black Hole Subpopulations in GWTC-4 with Binned Gaussian Processes: On the Origins of the $35M_{\odot }$ Peak
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