Rea et al. present the discovery of an SGR with a weak dipole field. This object emits bursts, has a strong persistent x-ray emission (i.e. it is hot) and exhibits pulsed profile changes -- it acts like a magnetar. The discovery points out what has been known unconsciously for a long time that the location of a pulsar on the P-Pdot diagram has little to do with its surface and internal fields. Rea et al. argue that this could mean that any pulsar could turn into a magnetar whenever. I think that this is a bit of a reach because we also think that magnetars are typically young as demonstrated by their association with supernova remnants and OB associations. Pretty Neat!
arXiv:1010.2781 [pdf, other] Title: A low-magnetic-field Soft Gamma Repeater
2 comments:
if "the location of a pulsar on the P-Pdot diagram has little to do with its surface and internal fields", why all the "magnetars" are in the same region of the P-Pdot diagram??? ;) Pretty Neat!
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