An infrared ring around the magnetar SGR 1900+14

S. Wachter, E. Ramirez-Ruiz, V. V. Dwarkadas, C. Kouveliotou, J. Granot, S. K. Patel, D. Figer

Research output: Contribution to journalArticlepeer-review


Magnetars are a special class of slowly rotating (period ∼5-12 s) neutron stars with extremely strong magnetic fields (>1014 G) - at least an order of magnitude larger than those of the 'normal' radio pulsars. The potential evolutionary links and differences between these two types of object are still unknown; recent studies, however, have provided circumstantial evidence connecting magnetars with very massive progenitor stars. Here we report the discovery of an infrared elliptical ring or shell surrounding the magnetar SGR 1900+14. The appearance and energetics of the ring are difficult to interpret within the framework of the progenitor's stellar mass loss or the subsequent evolution of the supernova remnant. We suggest instead that a dust-free cavity was produced in the magnetar environment by the giant flare emitted by the source in August 1998. Considering the total energy released in the flare, the theoretical dust-destruction radius matches well with the observed dimensions of the ring. We conclude that SGR 1900+14 is unambiguously associated with a cluster of massive stars, thereby solidifying the link between magnetars and massive stars.

Original languageEnglish
Pages (from-to)626-628
Number of pages3
Issue number7195
StatePublished - 29 May 2008
Externally publishedYes


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