Report

A Low-Magnetic-Field Soft Gamma Repeater

Science  12 Nov 2010:
Vol. 330, Issue 6006, pp. 944-946
DOI: 10.1126/science.1196088

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


This article has a correction. Please see:

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 ~ 1014 to 1015 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 × 1012 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.

View Full Text

Cited By...