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A low-magnetic-field soft gamma repeater

Abstract : 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
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https://hal-cea.archives-ouvertes.fr/cea-00862606
Contributor : Bruno Savelli <>
Submitted on : Tuesday, September 17, 2013 - 10:36:32 AM
Last modification on : Saturday, April 11, 2020 - 2:17:44 AM

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N. Rea, P. Esposito, R. Turolla, Gl Israel, S. Zane, et al.. A low-magnetic-field soft gamma repeater. Science, American Association for the Advancement of Science, 2010, 330 (6006), pp.944-946. ⟨10.1126/science.1196088⟩. ⟨cea-00862606⟩

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