期刊
SCIENCE
卷 330, 期 6006, 页码 944-946出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1196088
关键词
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资金
- Consejo Superior de Investigaciones Cientficas [AYA2009-07391, SGR2009-811]
- Autonomous Region of Sardinia
- Centre National d'Etudes Spatiales
- INAF Agenzia Spaziale Italiana [AAE I/088/06/0]
- STFC [ST/H00260X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H00260X/1] Funding Source: researchfish
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 similar to 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 x 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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