Adiabatic expansion, early X-ray data and the central engine in GRBs
نویسندگان
چکیده
منابع مشابه
Adiabatic expansion, early X-ray data and the central engine in GRBs
The Swift satellite early X-ray data show a very steep decay in most of the gamma-ray bursts light curves. This decay is either produced by the rapidly declining continuation of the central engine activity or by some leftover radiation starting right after the central engine shuts off. The latter scenario consists of the emission from an ‘ember’ that cools via adiabatic expansion and, if the je...
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The possible presence of thermal components in the early X-ray afterglows of γ-ray bursts is investigated. We discuss both the presence of a thermal continuum and, in particular, of collisional X-ray emission lines. We compute the predicted luminosity by a thin plasma for a range of metallicities for the continuum and the Kα lines of the elements Mg, Si, S, Ar, Ca and Fe. We show that light tra...
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HETE-2 has provided strong evidence that the properties of X-Ray Flashes (XRFs), X-ray-rich GRBs, and GRBs form a continuum, and therefore that these three kinds of bursts are the same phenomenon. In this paper, we explore a unified jet model of all three kinds of bursts, using population synthesis simulations of the bursts. We show that both the uniform jet and the universal jet models can exp...
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It is noted that X-ray tails (XRTs) of short, hard γ-ray bursts (SHBs) are similar to X-ray flashes (XRFs). We suggest a universal central engine hypothesis, as a way of accounting for this curiosity, in which SHBs differ from long γ-ray bursts (GRBs) in prompt emission because of the differences in the host star and attendant differences in the environment they present to the compact central e...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2009
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2009.14584.x