Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011acasn..52..288h&link_type=abstract
Acta Astronomica Sinica, vol. 52, no. 4, p. 288-296
Astronomy and Astrophysics
Astronomy
Gamma-Ray Bursts: General, Stars: Magnetars, Radiation Mechanisms: Non-Thermal, Methods: Numerical
Scientific paper
The central compact object of some gamma-ray bursts (GRBs) may be a strongly magnetized millisecond pulsar. In this model, there is an energy injection from the pulsar to the external forward shock through the magnetic dipole radiation. The energy injection would give rise to the shallow decay of the early afterglow. Recently, an interesting feature is discovered from many X-ray afterglows observed by Swift/XRT (X-ray Telescope): the shallow decay of some X-ray afterglows happens about 10^2˜10^4 s after the prompt emission. We have fitted 11 X-ray afterglow lightcurves of GRBs by using the magnetar energy injection model. The result shows the validity and universality of the magnetar energy injection model in explaining the post-shallow-decay phenomenon. Our fittings provide some constraints on the magnetic strength and the rotation period of the central magnetar.
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