Testing the magnetar model with the first low-B soft gamma repeater

Details Testing the magnetar model with the first low-B soft gamma repeater Testing the magnetar model with the first low-B soft gamma repeater

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..106r&link_type=abstract

XMM-Newton Proposal ID #06726701

Physics

Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, Sgr 0418+5732

Scientific paper

Soft gamma repeaters (SGRs) are part of a rapidly increasing group of x-ray sources exhibiting sporadic and powerful emission of short bursts and outbursts, believed to be magnetars, i.e. neutron stars powered by extreme magnetic fields (B~10^14-15 Gauss). We have recently discovered an SGR with a low magnetic field, SGR 0418+57, during outburst and after it emitted bursts similar to those of magnetars. X-ray observations show that its dipolar magnetic field cannot be greater than 7.5x10^12 Gauss, well in the range of ordinary radio pulsars. We ask here for a joint XMM/Chandra monitoring of the first low-B magnetar SGR 0418+57 in order to have a final measure of its period derivative, hence of it surface dipolar B field.

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