Time-resolved X-Ray Spectral Modeling of an Intermediate Burst from SGR 1900+14 Observed by HETE-2 FREGATE and WXM
Abstract
We present a detailed analysis of a 3.5 s long burst from SGR 1900+14 that occurred on 2001 July 2. The 2-150 keV time-integrated energy spectrum is well described by the sum of two blackbodies whose temperatures are approximately 4.3 and 9.8 keV. The time-resolved energy spectra are similarly well fitted by the sum of two blackbodies. The higher temperature blackbody evolves with time in a manner consistent with a shrinking emitting surface. The interpretation of these results in the context of the magnetar model suggests that the two-blackbody fit is an approximation of an absorbed, multitemperature spectrum expected on theoretical grounds rather than a physical description of the emission. If this is indeed the case, our data provide further evidence for a strong magnetic field and indicate that the entire neutron star was radiating during most of the burst duration.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2004
- DOI:
- 10.1086/424957
- arXiv:
- arXiv:astro-ph/0403162
- Bibcode:
- 2004ApJ...616.1148O
- Keywords:
-
- Stars: Pulsars: General;
- Stars: Individual: Alphanumeric: SGR 1900+14;
- Stars: Neutron;
- X-Rays: Bursts;
- Astrophysics
- E-Print:
- Accepted for publication in the Astrophysical Journal