Can a double component outflow explain the X-ray and optical lightcurves of <italic>Swift</italic> Gamma-Ray Bursts?

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Can a double component outflow explain the X-ray and optical lightcurves of Swift Gamma-Ray Bursts?

De Pasquale, Massimiliano / Evans, P. / Oates, S. / Page, M. / Zane, S. / Schady, P. / Breeveld, A. / Holland, S. / Still, M.

Abstract

Abstract An increasing sample of Gamma-Ray Bursts (GRBs) observed by Swift show evidence of ‘chromatic breaks’, i.e. breaks that are present in the X-ray but not in the optical. We find that in a significant fraction of these GRB afterglows the X-ray and the optical emission cannot be produced by the same component. We propose that these afterglow lightcurves are the result of a two-component jet, in which both components undergo energy injection for the whole observation and the X-ray break is due to a jet break in the narrow outflow. Bursts with chromatic breaks also explain another surprising finding, the paucity of late achromatic breaks. We propose a model that may explain the behaviour of GRB emission in both X-ray and optical bands. This model can be a radical and noteworthy alternative to the current interpretation for the ‘canonical’ XRT and UVOT lightcurves, and it bears fundamental implications for GRB physics.

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Dokumentinformationen

Titel :

Can a double component outflow explain the X-ray and optical lightcurves of Swift Gamma-Ray Bursts?

Beteiligte:

De Pasquale, Massimiliano (Autor:in) / Evans, P. (Autor:in) / Oates, S. (Autor:in) / Page, M. (Autor:in) / Zane, S. (Autor:in) / Schady, P. (Autor:in) / Breeveld, A. (Autor:in) / Holland, S. (Autor:in) / Still, M. (Autor:in)

Erschienen in:

Advances in Space Research ; 48 , 8 ; 1411-1414

Erscheinungsdatum :

2011-06-05

Format / Umfang :

4 pages

ISSN :

0273-1177

DOI :

https://doi.org/10.1016/j.asr.2011.06.006

Medientyp :

Aufsatz (Zeitschrift)