Panaitescu, A. 2010 光学余辉的峰和平台

主要内容:
列出了光学余辉的主要两种：一种有峰值，一种是平台。并试图解释原因。
还列出一些光学和X射线余辉的对比。

精彩摘抄:

还有一个统计关系：

有X和光学一致的光变

Add caption

也有不一致的：

文章信息:

· Find Similar Abstracts (with default settings below)

· arXiv e-print (arXiv:1009.3947)

· References in the Article

·

· Translate This Page

Title:		Optical afterglows of Gamma-Ray Bursts: peaks, plateaus, and possibilities
Authors:		Panaitescu, A.; Vestrand, W. T.
Publication:		eprint arXiv:1009.3947
Publication Date:		09/2010
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		10 pages, submitted to MNRAS
Bibliographic Code:		2010arXiv1009.3947P

Abstract

The optical light-curves of GRB afterglows display either peaks or plateaus. We identify 15 afterglows of the former type and 20 of the latter. Their optical energy release is similar and is correlated to the GRB output, the correlation being stronger for peaky afterglows. That suggests that the prompt (burst) and delayed emissions of peaky afterglows are from the same relativistic ejecta and that the optical emission of plateau afterglows arises more often from ejecta that did not produce the burst emission. Consequently, we propose that peaky optical afterglows are from impulsive ejecta releases and that plateau optical afterglows originate from long-lived engines, the break in the optical light-curve (peak or plateau end) marking the onset of the entire outflow deceleration. In the peak luminosity--peak time plane, the distribution of peaky afterglows displays an edge with L_p propto t_p^{-3}, which is more likely to arise from variations (among afterglows) in the ambient medium density. The fluxes and epochs of optical plateau breaks follow a L_b propto t_b^{-0.5} anticorrelation which arises, perhaps, from an upper limit to the afterglow output. Sixty percent of 25 afterglows that were well monitored in both the optical and X-ray show coupled decays at these frequencies, with comparable decays indices and achromatic light-curve breaks. The other 40 percent display three types of decoupled light-curves: i) chromatic optical light-curve breaks (that could be due to the peak of the synchrotron spectrum crossing the optical), ii) X-ray flux decays faster than in the optical (suggesting that the X-ray emission is from local inverse-Compton scattering), and iii) chromatic X-ray light-curve breaks (which suggest that the X-ray emission is from external up-scattering).

---

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