Next Article in Journal
The Disk-Driven Jet of Cygnus A
Previous Article in Journal
A Search for Blazar-Like Radio-Loud Narrow-Line Seyfert 1 Galaxies
Previous Article in Special Issue
Black Hole Accretion in Gamma Ray Bursts
Article Menu

Export Article

Open AccessArticle
Galaxies 2017, 5(2), 21; doi:10.3390/galaxies5020021

The Signature of the Blandford-Znajek Mechanism in GRB Light Curves

1
Research Center for Astronomy and Applied Mathematics, Academy of Athens, Athens 11527, Greece
2
National Research Nuclear University MEPhI, 115409 Moscow, Russia
3
Institute for Theoretical Physics, D-60438 Frankfurt, Germany
4
Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, 15783 Athens, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Emilio Elizalde
Received: 7 September 2016 / Revised: 24 January 2017 / Accepted: 24 January 2017 / Published: 12 April 2017
(This article belongs to the Special Issue Gamma-Ray Bursts: Recent Theoretical Models and Observations)
View Full-Text   |   Download PDF [520 KB, uploaded 12 April 2017]   |  

Abstract

In 1977, Blandford and Znajek showed how the spin energy of a rotating black hole may be extracted electromagnetically through a magnetic field that threads the black hole horizon. A characteristic feature of this mechanism is that, under certain fairly general conditions, the energy loss rate decays exponentially. We looked precisely for such behavior in the X-ray light curves of Long and Ultra Long duration Gamma-Ray Bursts (GRBs) observed with the XRT instrument on board the Swift satellite, and found that almost 30% of XRT light curves show an exponential decay before they reach the afterglow plateau. A similar behavior (Fast Rise Exponential Decay-FRED) was observed in γ -rays with the BATSE instrument aboard the CGRO satellite. We consider both of these findings as the signature of the Blandford-Znajek mechanism in action in the central engine of GRBs. View Full-Text
Keywords: gamma-ray bursts; black holes; magnetic fields gamma-ray bursts; black holes; magnetic fields
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Contopoulos, I.; Nathanail, A.; Strantzalis, A. The Signature of the Blandford-Znajek Mechanism in GRB Light Curves. Galaxies 2017, 5, 21.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Galaxies EISSN 2075-4434 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top