Gamma-ray upper limits on magnetars with 6 years of Fermi-LAT observations

Abstract

We report on the search for gamma-ray emission from 20 magnetars using 6 years of Fermi, Large Area Telescope (LAT) observations. No significant evidence for gamma-ray emission from any of the currently-known magnetars is found. We derived the most stringent upper limits to date on the 0.1--10 GeV emission of Galactic magnetars, which are estimated between $\sim 10^{-12}-10^{-11}$ erg s${}^{-1}$ cm${}^{-2}$. Gamma-ray pulsations were searched for the four magnetars having reliable ephemerides over the observing period, but none were detected. On the other hand, we also studied the gamma-ray morphology and spectra of seven Supernova Remnants associated or adjacent to the magnetars.

22 pages, 4 figures, 2 tables, submitted to ApJ

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• Towards observing reverberating and superefficient pulsar wind nebulae
• High-Energy Photon Opacity in the Twisted Magnetospheres of Magnetars
• Visualizing the pulsar population using graph theory
• A Study of Fermi-LAT GeV gamma-ray Emission towards the Magnetar-harboring Supernova Remnant Kesteven 73 and Its Molecular Environment
• On the Origin of the Gamma-Ray Emission toward SNR CTB 37A with $Fermi$-LAT
• Galactic transient sources with the Cherenkov Telescope Array Observatory
• Gamma-ray Emission of the Kes 73/1E 1841-045 Region Observed with the Fermi Large Area Telescope
• Search for transient gamma-ray emission from magnetar flares using Fermi-LAT
• Unveiling the nature of the unidentified gamma-ray sources 4FGL J1908.6+0915e, HESS J1907+089/HOTS J1907+091, and 3HWC J1907+085 in the sky region of the magnetar SGR 1900+14
• Resonant Inverse Compton Scattering and Hard X-ray Emission in Magnetar Magnetospheres
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