Name: Grb 090417b and Its Host Galaxy: A Step Towards an Understanding of Optically-Dark Gamma-Ray Bursts
Price: 956.00 TWD
Availability: InStock
Author: Holland, Stephen T. ; Nasa Technical Reports Server (Ntrs) ; Et Al
ISBN: 9781287278436

portada Grb 090417b and Its Host Galaxy: A Step Towards an Understanding of Optically-Dark Gamma-Ray Bursts

Grb 090417b and Its Host Galaxy: A Step Towards an Understanding of Optically-Dark Gamma-Ray Bursts

Type

Physical Book

Author

Nasa Technical Reports Server (Ntrs)

Stephen T. Holland

Publisher

Bibliogov

Language

English

Pages

Format

Paperback

Dimensions

24.6 x 18.9 x 0.2 cm

Weight

0.09 kg.

ISBN13

9781287278436

Synopsis "Grb 090417b and Its Host Galaxy: A Step Towards an Understanding of Optically-Dark Gamma-Ray Bursts"

GRB 090417B was an unusually long burst with a T(sub 90) duration of at least 2130 s and a multi-peaked light curve at energies of 15-150 keV. It was optically dark and has been convincingly associated with a bright star-forming galaxy at a redshift of 0.345 that is broadly similar to the Milky Way. This is one of the few cases where a host galaxy has been clearly identified for a dark gamma-ray burst and thus an ideal candidate for studying the origin of dark bursts. We find that the dark nature of GRB 090417B can not be explained by high redshift, incomplete observations, or unusual physics in the production of the afterglow. The Swift/XRT X-ray data are consistent with the afterglow being obscured by a dense, localized sheet of dust approximately 30-80 pc from the burst along the line of sight. Assuming the standard relativistic fireball model for the afterglow we find that the optical flux is at least 2.5 mag fainter than predicted by the X -ray flux. We are able to explain the lack of an optical afterglow, and the evolution of the X -ray spectrum, by assuming that there is a sheet of dust along the line of sight approximately 30-80 pc from the progenitor. Our results suggest that this dust sheet imparts an extinction of A(sub v)> or = 12 mag, which is sufficient to explain the missing optical flux. GRB 090417B is an example of a gamma-ray burst that is dark due to the localized dust structure in its host galaxy.

Customers reviews

Have you read this book? Login to add your review.

More customer reviews

0% (0)
0% (0)
0% (0)
0% (0)
0% (0)

Questions and Answers about the Book

Do you have a question about the book? Login to be able to add your own question.

Opinions about Bookdelivery

More customer reviews

Grb 090417b and Its Host Galaxy: A Step Towards an Understanding of Optically-Dark Gamma-Ray Bursts - Holland, Stephen T. ; Nasa Technical Reports Server (Ntrs) ; Et Al

Synopsis "Grb 090417b and Its Host Galaxy: A Step Towards an Understanding of Optically-Dark Gamma-Ray Bursts"

Customers reviews

Frequently Asked Questions about the Book

Is the book original?

In what language is the book written?

What is the format of this book?

Questions and Answers about the Book

Opinions about Bookdelivery