%0 Journal Article %T A low-magnetic-field soft gamma repeater %+ Institut de Ciencies de l'Espai [Barcelona] (ICE-CSIC) %+ Istituto di Astrofisica Spaziale e Fisica Cosmica - Milano (IASF-MI) %+ Università degli Studi di Padova = University of Padua (Unipd) %+ Mullard Space Science Laboratory (MSSL) %+ Istituto Nazionale di Astrofisica (INAF) %+ Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)) %+ Sabanci University [Istanbul] %+ NASA Marshall Space Flight Center (MSFC) %A Rea, N. %A Esposito, P. %A Turolla, R. %A Israel, G., L. %A Zane, S. %A Stella, L. %A Mereghetti, S. %A Tiengo, A. %A Götz, D. %A Göğüş, E. %A Kouveliotou, C. %Z This article has a correction. Please see: https://science.sciencemag.org/content/330/6011/1627.1 %< avec comité de lecture %@ 0036-8075 %J Science %I American Association for the Advancement of Science (AAAS) %V 330 %N 6006 %P 944-946 %8 2010 %D 2010 %R 10.1126/science.1196088 %Z Physics [physics]/Astrophysics [astro-ph]Journal articles %X Soft gamma repeaters (SGRs) and anomalous x-ray pulsars form a rapidly increasing group of x-ray sources exhibiting sporadic emission of short bursts. They are believed to be magnetars, that is, neutron stars powered by extreme magnetic fields, $B ~ 10^{14}$ to 10$^{15}$ gauss. We report on a soft gamma repeater with low magnetic field, SGR 0418+5729, recently detected after it emitted bursts similar to those of magnetars. X-ray observations show that its dipolar magnetic field cannot be greater than 7.5 × 10$^{12}$ gauss, well in the range of ordinary radio pulsars, implying that a high surface dipolar magnetic field is not necessarily required for magnetar-like activity. The magnetar population may thus include objects with a wider range of B-field strengths, ages, and evolutionary stages than observed so far. %G English %2 https://cea.hal.science/cea-00862606/document %2 https://cea.hal.science/cea-00862606/file/rea1.pdf %L cea-00862606 %U https://cea.hal.science/cea-00862606 %~ CEA %~ INSU %~ CNRS %~ UP-SCIENCES