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An infrared ring around the magnetar SGR 1900+14
S Wachter1, E Ramirez-Ruiz, V V Dwarkadas
1Spitzer Science Center, California Institute of Technology, Pasadena, California 91125, USA. wachter@ipac.caltech.edu
Nature
|May 30, 2008
Summary
Astronomers discovered an infrared ring around the magnetar SGR 1900+14. This ring supports the theory that magnetars originate from massive stars and are shaped by giant flares.
Area of Science:
- Astronomy and Astrophysics
- High-Energy Astrophysics
- Neutron Star Physics
Background:
- Magnetars are neutron stars with exceptionally strong magnetic fields, distinct from radio pulsars.
- Previous research suggested a link between magnetars and massive progenitor stars.
- The evolutionary relationship between magnetars and other neutron stars remains unclear.
Purpose of the Study:
- To investigate the nature of the infrared ring surrounding the magnetar SGR 1900+14.
- To determine the origin and formation mechanism of the observed ring structure.
- To solidify the connection between magnetars and massive stars.
Main Methods:
- Observation of the magnetar SGR 1900+14 using infrared imaging.
- Analysis of the ring's morphology, size, and energetics.
- Comparison of observational data with theoretical models of stellar evolution and magnetar flares.
Main Results:
- Discovery of an elliptical infrared ring or shell around the magnetar SGR 1900+14.
- The ring's characteristics are inconsistent with standard stellar mass loss or supernova remnant evolution.
- A theoretical model of a dust-free cavity created by a giant magnetar flare in 1998 accurately predicts the ring's dimensions.
Conclusions:
- The observed infrared ring is likely a consequence of a giant flare from the magnetar SGR 1900+14.
- This finding provides strong evidence for the association of SGR 1900+14 with a cluster of massive stars.
- The study solidifies the link between magnetars and massive stellar progenitors.
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