Lyons 2009 Spin down magetar解释X射线余辉光变

主要内容:


精彩摘抄:


文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:0908.3798)

· References in the Article

·

· Translate This Page

Title:		Can X-ray emission powered by a spinning-down magnetar explain some GRB light curve features?
Authors:		Lyons, N.; O'Brien, P. T.; Zhang, B.; Willingale, R.; Troja, E.; Starling, R. L. C.
Publication:		eprint arXiv:0908.3798
Publication Date:		08/2009
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		10 pages, 5 figures, accepted by MNRAS
Bibliographic Code:		2009arXiv0908.3798L

Abstract

Long duration gamma-ray bursts (GRBs) are thought to be produced by the core-collapse of a rapidly-rotating massive star. This event generates a highly relativistic jet and prompt gamma-ray and X-ray emission arises from internal shocks in the jet or magnetised outflows. If the stellar core does not immediately collapse to a black hole, it may form an unstable, highly magnetised millisecond pulsar, or magnetar. As it spins down, the magnetar would inject energy into the jet causing a distinctive bump in the GRB light curve where the emission becomes fairly constant followed by a steep decay when the magnetar collapses. We assume that the collapse of a massive star to a magnetar can launch the initial jet. By automatically fitting the X-ray lightcurves of all GRBs observed by the Swift satellite we identified a subset of bursts which have a feature in their light curves which we call an internal plateau -- unusually constant emission followed by a steep decay -- which may be powered by a magnetar. We use the duration and luminosity of this internal plateau to place limits on the magnetar spin period and magnetic field strength and find that they are consistent with the most extreme predicted values for magnetars.

---

Bibtex entry for this abstract Preferred format for this abstract (see Preferences)