The Short Bursts in SGR 1806-20, 1E 1048-5937, and SGR 0501+4516
Abstract
We analyzed temporal and spectral properties, focusing on the short bursts, for three anomalous X-ray pulsars (AXPs) and soft gamma repeaters (SGRs), including SGR 1806-20, 1E 1048-5937 and SGR 0501+4516. Using the data from XMM-Newton, we located the short bursts by Bayesian blocks algorithm. The short bursts' duration distributions for three sources were fitted by two lognormal functions. The spectra of shorter bursts ($< 0.2~\rm s$) and longer bursts ($\geq 0.2~\rm s$) can be well fitted in two blackbody components model or optically thin thermal bremsstrahlung model for SGR 0501+4516. We also found that there is a positive correlation between the burst luminosity and the persistent luminosity with a power law index $\gamma = 1.23 \pm 0.18 $. The energy ratio of this persistent emission to the time averaged short bursts is in the range of $10 - 10^3$, being comparable to the case in Type I X-ray burst.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- March 2015
- DOI:
- 10.1086/680484
- arXiv:
- arXiv:1403.6244
- Bibcode:
- 2015PASP..127..211Q
- Keywords:
-
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Accepted by PASP