A Magnetar Mystery: The Nature of the Ring around SGR 1900+14

Details A Magnetar Mystery: The Nature of the Ring around SGR 1900+14 A Magnetar Mystery: The Nature of the Ring around SGR 1900+14

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50101w&link_type=abstract

Spitzer Proposal ID #50101

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Scientific paper

Soft Gamma repeaters (SGRs) and anomalous X-ray pulsars are thought to be 'magnetars', isolated young neutron stars that are powered by the decay of their ultrahigh magnetic fields. At the same time, we now also know of a small sample of radio pulsars with magnetic field strengths approaching or overlapping those of the magnetar candidates, that do not exhibit the same type of high energy phenomena. This raises the question why some neutron stars are 'normal' radio pulsars, while others are X-ray and gamma-ray emitting magnetars. We have discovered a ring of emission around SGR 1900+14 with Spitzer at 16 and 24 micron which might provide clues to the nature of the progenitor and the formation of the SGR. However, the ring is not detected at optical, near-IR, radio, or X-ray wavelengths and is difficult to interpret within the current framework of stellar mass loss and supernova remnant evolution. We propose Spitzer IRS spectroscopic follow-up observations to determine the physical properties of the ring material and possibly unveil the nature of the progenitor of the SGR.

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