Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-17
Astrophys.J. 604 (2004) 312-316
Astronomy and Astrophysics
Astrophysics
13 pags, 2 tables, appear in v603 n1 pt1 ApJ March 1, 2004 issue
Scientific paper
10.1086/381427
Extremely powerful emission lines are observed in the X-ray afterglow of several GRBs. The energy contained in the illuminating continuum which is responsible for the line production exceeds 10$^{51}$ erg, much higher than that of the collimated GRBs. It constrains the models which explain the production of X-ray emission lines. In this paper, We argue that this energy can come from a continuous postburst outflow. Focusing on a central engine of highly magnetized millisecond pulsar or magnetar we find that afterglow can be affected by the illuminating continuum, and therefore a distinct achromatic bump may be observed in the early afterglow lightcurves. With the luminosity of the continuous outflow which produces the line emission, we define the upper limit of the time when the bump feature appears. We argue that the reason why the achromatic bumps have not been detected so far is that the bumps should appear at the time too early to be observed.
Gao Wei-Hong
Wei Da-Ming
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