Nardini 2014 GRB 100814A的余辉和模型

主要内容:
说余辉很复杂，目前的简单模型是不行的。

精彩摘抄:

X射线光变：

光学：

光学和X射线放一起：

谱：

文章信息:

---

· Find Similar Abstracts (with default settings below)

· Electronic Refereed Journal Article (HTML)

· Full Refereed Journal Article (PDF/Postscript)

· arXiv e-print (arXiv:1312.1335)

· References in the article

· Also-Read Articles (Reads History)

·

· Translate This Page

Title:		Afterglow rebrightenings as a signature of a long-lasting central engine activity?. The emblematic case of GRB 100814A
Authors:		Nardini, M.; Elliott, J.; Filgas, R.; Schady, P.; Greiner, J.; Krühler, T.; Klose, S.; Afonso, P.; Kann, D. A.; Nicuesa Guelbenzu, A.; Olivares E., F.; Rau, A.; Rossi, A.; Sudilovsky, V.; Schmidl, S.
Affiliation:		AA(Università degli studi di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italy marco.nardini@unimib.it), AB(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748, Garching, Germany), AC(Institute of Experimental and Applied Physics, Czech Technical University in Prague, Horska 3a/22, 12800, Prague 2, Czech Republic), AD(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748, Garching, Germany), AE(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748, Garching, Germany), AF(Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100, Copenhagen, Denmark; European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago 19, Chile), AG(Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, Germany), AH(American River College, Physics and Astronomy Dpt., 4700 College Oak Drive, Sacramento, CA, 95841, USA), AI(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748, Garching, Germany), AJ(Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, Germany), AK(Departamento de Ciencias Fisicas, Universidad Andres Bello, Avda. Republica 252, Santiago, Chile), AL(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748, Garching, Germany), AM(Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, Germany), AN(Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse 1, 85748, Garching, Germany), AO(Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778, Tautenburg, Germany)
Publication:		Astronomy & Astrophysics, Volume 562, id.A29, 11 pp. (A&A Homepage)
Publication Date:		02/2014
Origin:		EDP Sciences
Astronomy Keywords:		gamma-ray burst: individual: GRB 100814A, techniques: photometric, radiation mechanisms: non-thermal
DOI:		10.1051/0004-6361/201321525
Bibliographic Code:		2014A&A...562A..29N

Abstract

Context. In the past few years the number of well-sampled optical to near-infrared (NIR) light curves of long gamma-ray bursts (GRBs) has greatly increased, particularly due to simultaneous multi-band imagers such as GROND. Combining these densely sampled ground-based data sets with the Swift UVOT and XRT space observations unveils a much more complex afterglow evolution than what was predicted by the most commonly invoked theoretical models. GRB 100814A represents a remarkable example of these interesting well-sampled events, showing a prominent late-time rebrightening in the optical to NIR bands and a complex spectral evolution. This represents a unique laboratory to test the different afterglow emission models.
Aims: Here we study the nature of the complex afterglow emission of GRB 100814A in the framework of different theoretical models. Moreover, we compare the late-time chromatic rebrightening with those observed in other well-sampled long GRBs.
Methods: We analysed the optical and NIR observations obtained with the seven-channel Gamma-Ray burst Optical and Near-infrared Detector (GROND) at the 2.2 m MPG/ESO telescope together with the X-ray and UV data detected by the instruments onboard the Swift observatory. The broad-band afterglow evolution, achieved by constructing multi-instrument light curves and spectral energy distributions, is discussed in the framework of different theoretical models.
Results: We find that the standard models that describe the broad-band afterglow emission within the external shock scenario fail to describe the complex evolution of GRB 100814A, and therefore more complex scenarios must be invoked. The analysis of the very well sampled broad-band light curve of GRB 100814A allowed us to deduce that models invoking late-time activity of the central engine in the observed afterglow emission are the preferred ones for all the different observed features. This late-time activity most likely has the form of a delayed reactivation of the ejecta emission process. However, a more detailed modelling of the radiative mechanisms associated with these scenarios is necessary to arrive at a firm conclusion on the nature of the optical rebrightenings that so often are detected in long GRBs.
Full GROND and UVOT photometry tables are available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/562/A29

---

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