Abdo, A. A.A. A.AbdoAckermann, M.M.AckermannAjello, M.M.AjelloGiommi, PaoloPaoloGiommiTosti, G.G.Tosti2020-09-172020-09-172010-12-01https://hdl.handle.net/20.500.13025/1819The Astrophysical Journal Letters, Volume 725, Issue 1, pp. L73-L78 (2010).We report on the search for 0.1–10 GeV emission from magnetars in 17 months of Fermi Large Area Telescope (LAT) observations. No significant evidence for gamma-ray emission from any of the currently known magnetars is found. The most stringent upper limits to date on their persistent emission in the Fermi energy range are estimated between ~10−12and10−10 erg s−1 cm−2, depending on the source. We also searched for gamma-ray pulsations and possible outbursts, also with no significant detection. The upper limits derived support the presence of a cutoff at an energy below a few MeV in the persistent emission of magnetars. They also show the likely need for a revision of current models of outer-gap emission from strongly magnetized pulsars, which, in some realizations, predict detectable GeV emission from magnetars at flux levels exceeding the upper limits identified here using the Fermi-LAT observations.gamma rays starsmagnetic fieldspulsars individual 4U 0142+614 1E 1048.1--5937 1E 1841--045 1E 1547--5408 1RXS J1708--4009 XTE J1810--197 CXOU J1647--4552 1E 2259+586 SGR 1900+14 SGR 1806--20 SGR 1627--41 SGR 0501+4516 SGR 0418+5729stars magnetarsjournal article10.1088/2041-8205/725/1/L73http://adsabs.harvard.edu/abs/2010ApJ...725L..73A2010ApJ...725L..73A