Search for Gamma-ray Emission from Magnetars with the Fermi Large Area Telescope
Ozaki, M.; Troja, E.; Caraveo, P. A.; Frailis, M.; Orlando, E.; Abdo, A. A.; Ackermann, M.; Ajello, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Baring, M. G.; Bastieri, D.; Bellazzini, R.; Blandford, R. D.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Bregeon, J.; Brigida, M.; Bruel, P.; Burnett, T. H.; Caliandro, G. A.; Cameron, R. A.; Cecchi, C.; Çelik, Ö.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Conrad, J.; de Angelis, A.; de Palma, F.; Dormody, M.; Silva, E. do Couto e.; Drell, P. S.; Dubois, R.; Dumora, D.; Favuzzi, C.; Fusco, P.; Gargano, F.; Gehrels, N.; Giglietto, N.; Giordano, F.; Glanzman, T.; Godfrey, G.; Grenier, I. A.; Grondin, M. -H.; Guiriec, S.; Hadasch, D.; Harding, A. K.; Hays, E.; Jóhannesson, G.; Johnson, A. S.; Katagiri, H.; Kataoka, J.; Knödlseder, J.; Kuss, M.; Lande, J.; Lemoine-Goumard, M.; Longo, F.; Loparco, F.; Lovellette, M. N.; Lubrano, P.; Makeev, A.; Marelli, M.; Mazziotta, M. N.; McEnery, J. E.; Michelson, P. F.; Mizuno, T.; Moiseev, A. A.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nolan, P. L.; Nuss, E.; Ohsugi, T.; Omodei, N.; Ormes, J. F.; Paneque, D.; Parent, D.; Pepe, M.; Pesce-Rollins, M.; Piron, F.; Porter, T. A.; Rainò, S.; Rando, R.; Razzano, M.; Rea, N.; Reimer, A.; Reimer, O.; Reposeur, T.; Sadrozinski, H. F. -W.; Saz Parkinson, P. M.; Sgrò, C.; Siskind, E. J.; Smith, D. A.; Spandre, G.; Spinelli, P.; Strickman, M. S.; Takahashi, H.; Tanaka, T.; Thayer, J. B.; Thompson, D. J.; Tibaldo, L.; Torres, D. F.; Tosti, G.; Tramacere, A.; Usher, T. L.; Vasileiou, V.; Vitale, V.; Waite, A. P.; Winer, B. L.; Wood, K. S.; Ziegler, M.; Dermer, C. D.; Giommi, P.; Giroletti, M.; Okumura, A.; Uchiyama, Y.; Yang, Z.; Chaty, S.; Israel, G. L.; den Hartog, P. R.; Vianello, G.; Enoto, T.; Naumann-Godo, M.; Bouvier, A.; Lee, S. -H.; Ritz, S.; Vandenbroucke, J.; Hanabata, Y.; Kaspi, V. M.; Allafort, A.; Mehault, J.; Dib, R.
United States, Italy, France, Spain, Sweden, Canada, Japan, Iceland, Germany, Austria, Switzerland
Abstract
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.