13-18 December 2015
International Conference Centre Geneva
Europe/Zurich timezone

Very fast TeV gamma-ray variability from the non-aligned AGN IC 310: Insight into Black Hole Lightnings

15 Dec 2015, 14:42
Level 0, Room 4 (International Conference Centre Geneva)

Level 0, Room 4

International Conference Centre Geneva

17 Rue de Varembé, 1211 Geneva


Pierre Colin (MPI fuer Physik)


Rapid flux variabilities with time scales of minutes are regularly detected in the very high energy (VHE) gamma-ray emission of blazars during violent flaring periods. Those are generally explained by the classical shock-in-jet acceleration models, assuming a very large Doppler factor, which condenses the intrinsic multi-hours-scale variations into a few minutes for the observer on Earth. This assumption, which requires a large jet Lorentz factor (>10) and very small angle between the jet and the observer (<5 deg), is conceivable for blazars. However, recent observation of rapid variabilities in the VHE gamma-ray flux from the peculiar radio galaxy IC 310 by MAGIC is very challenging for the shock-in-jet model. Indeed the jet viewing angle is estimated to lie between 10 and 20 deg, and the Doppler boost cannot play a dramatic role. The flux doubling-time measured in November 2012 is faster than 5 min and constrains the size of the emission region to be smaller than 20% of the gravitational radius of the central black hole. Here, we will present in detail the MAGIC observations and discuss possible alternative models, such as pulsar-like particle acceleration in the magnetosphere anchored to the plasma surrounding a spinning black hole.
Collaboration MAGIC

Primary authors

Dorit Glawion Julian Sitarek (University of Łódź) Prof. Karl Mannheim (Uni Wuerzburg) Pierre Colin (MPI fuer Physik)


Eduardo Ros (Instituto de Fisica Corpuscular (ES)) Felicia Krauss (Uni Wuerzburg) Joern Wilms (Uni Erlangen-Nuerberg) Matthias Kadler (Uni Würzburg) Robert Schulz (Uni Wuerzburg)

Presentation Materials