Constraints on the extragalactic magnetic field strength from blazar spectra based on 145 months of Fermi-LAT observations

Abstract

Properties of the extragalactic magnetic field (EGMF) outside of clusters and filaments of the large-scale structure are essentially unknown. The EGMF could be probed with $\gamma$-ray observations of distant (redshift $z>0.1$) blazars. TeV $\gamma$ rays from these sources are strongly absorbed on extragalactic background light photons; secondary electrons and positrons produce cascade $\gamma$ rays with the observable flux dependent on EGMF parameters. We put constraints on the EGMF strength using 145 months of Fermi-LAT observations of the blazars 1ES 1218+304, 1ES 1101-232, and 1ES 0347-121, and imaging atmospheric Cherenkov telescope observations of the same sources. We perform a series of full direct Monte Carlo simulations of intergalactic electromagnetic cascades with the ELMAG 3.01 code and construct a model of the observable spectra inside the point spread functions of the observing instruments for a range of EGMF strengths. We compare the observed spectra with the models for various values of the EGMF strength $B$ and calculate the exclusion statistical significance for every value of $B$. We find that the values of the EGMF strength $B\le 10^{-17}$ G are excluded at a high level of the statistical significance $Z>4\sigma$ for all the four options of the intrinsic spectral shape considered (power-law, power-law with exponential cutoff, log-parabola, log-parabola with exponential cutoff). The value of $B=10^{-16}$ G is not excluded; it is still a viable option of the EGMF strength. These results were obtained for the case of steady sources.

arXiv comment10 pages, 6 figures, 2 tables. Published in MNRAS. This is the authors' version, not the final typeset. Minor main text changes w.r.t. v2, two appendices added. Supplementary material is available at https://doi.org/10.5281/zenodo.6483355

References in corpus (55)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• The NumPy array: a structure for efficient numerical computation
• The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
• Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe
• Fermi Large Area Telescope Fourth Source Catalog
• Magnetic Fields in the Early Universe
• Evidence for strong extragalactic magnetic fields from Fermi observations of TeV blazars
• Design Concepts for the Cherenkov Telescope Array
• Cosmological Magnetic Fields: Their Generation, Evolution and Observation
• A low level of extragalactic background light as revealed by gamma-rays from blazars
• The major upgrade of the MAGIC telescopes, Part II: A performance study using observations of the Crab Nebula
• Semi-analytic modeling of the EBL and consequences for extragalactic gamma-ray spectra
• The Status of the H.E.S.S. Project
• EGMF Constraints from Simultaneous GeV-TeV Observations of Blazars
• The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system
• The Cosmological Impact of Luminous TeV Blazars I: Implications of Plasma Instabilities for the Intergalactic Magnetic Field and Extragalactic Gamma-Ray Background
• Time Delay of Cascade Radiation for TeV Blazars and the Measurement of the Intergalactic Magnetic Field
• Very High Energy Gamma-Rays from AGN: Cascading on the Cosmic Background Radiation Fields and the Formation of Pair Halos
• Sensitivity of gamma-ray telescopes for detection of magnetic fields in intergalactic medium
• New limits on extragalactic magnetic fields from rotation measures
• Search for Spatial Extension in High-Latitude Sources Detected by the Fermi Large Area Telescope
• Fermi/LAT observations of 1ES 0229+200: implications for extragalactic magnetic fields and background light
• Detection of VHE gamma-ray emission from the distant blazar 1ES 1101-232 with H.E.S.S. and broadband characterisation
• Progress on Cosmological Magnetic Fields
• Black Hole Masses and Host Galaxy Evolution of Radio-loud Active Galactic Nuclei
• Constraints on the Intergalactic Magnetic Field with Gamma-Ray Observations of Blazars
• Discovery of VHE gamma-rays from the distant BL Lac 1ES 0347-121
• Relativistic Pair Beams from TeV Blazars: A Source of Reprocessed GeV Emission rather than IGM Heating
• Probing Intergalactic Magnetic Fields in the GLAST Era through Pair Echo Emission from TeV Blazars
• Progress in unveiling extreme particle acceleration in persistent astrophysical jets
• Relaxation of Blazar Induced Pair Beams in Cosmic Voids
• The Gamma-Ray Window to Intergalactic Magnetism
• ELMAG: A Monte Carlo simulation of electromagnetic cascades on the extragalactic background light and in magnetic fields
• Search for Magnetically Broadened Cascade Emission From Blazars with VERITAS
• Search for Extended γ-ray Emission around AGN with H.E.S.S. and Fermi-LAT
• Probing the Nature of the Weakest Intergalactic Magnetic Fields with the High Energy Emission of Gamma-Ray Bursts
• Delayed GeV--TeV Photons from Gamma-Ray Bursts Producing High-Energy Cosmic Rays
• Plasma effects on fast pair beams II. Reactive versus kinetic instability of parallel electrostatic wave
• Intergalactic Magnetic Fields and Gamma Ray Observations of Extreme TeV Blazars
• The Effect of Nonlinear Landau Damping on Ultrarelativistic Beam Plasma Instabilities
• The electrostatic instability for realistic pair distributions in blazar/EBL cascades
• Massive Argon Space Telescope (MAST): a concept of heavy time projection chamber for gamma-ray astronomy in the 100 MeV --- 1 TeV energy range
• ELMAG 3.01: A three-dimensional Monte Carlo simulation of electromagnetic cascades on the extragalactic background light and in magnetic fields
• Energy loss of intergalactic pair beams: Particle-in-Cell simulation
• Electromagnetic cascade masquerade: a way to mimic $\gamma$--axion-like particle mixing effects in blazar spectra
• The role of resonant plasma instabilities in the evolution of blazar induced pair beams
• Revisit of non-linear Landau damping for electrostatic instability driven by blazar-induced pair beams
• Properties of the Intergalactic Magnetic Field Constrained by Gamma-ray Observations of Gamma-Ray Bursts
• Sensitivity of the Cherenkov Telescope Array to the Detection of Intergalactic Magnetic Fields
• Can we constrain the extragalactic magnetic field from very high energy observations of GRB 190114C?
• Performance of the upgraded H.E.S.S. cameras
• Observable spectral and angular distributions of $\gamma$-rays from extragalactic ultrahigh energy cosmic ray accelerators: the case of extreme TeV blazars
• VERITAS Long-Term Observations of Hard Spectrum Blazars
• Nonthermal Radiation of the Extreme TeV Blazar 1ES 0229+200 from Electromagnetic Cascades on Infrared Photon Field

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