A model for delayed emission in a very-high energy gamma-ray flare in Markarian 501

Abstract

Recently, the MAGIC collaboration reported evidence for a delay in the arrival times of photons of different energies during a gamma-ray flare from the blazar Markarian 501 on 2005 July 9. We apply a homogeneous synchrotron self-Compton (SSC) model under the assumption that the blob containing relativistic electrons was observed in its acceleration phase. This modified SSC model predicts the appearance of a gamma-ray flare first at lower energies and subsequently at higher energies. Based on the reported time delay of approx. 240 s between the flare observed at 190 GeV and 2.7 TeV, we predict a delay on the order of 1 h if observed between 10 GeV and 100 GeV. Such delay timescales can be tested in the future by simultaneous flare observations with the Gamma Ray Large Area Space Telescope (GLAST) and Cherenkov telescopes.

arXiv comment4 pages, no figures, Astronomy & Astrophysics in press

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• String Quantum Gravity, Lorentz-Invariance Violation and Gamma-Ray Astronomy
• Constraining Lorentz invariance violation using the Crab Pulsar emission observed up to TeV energies by MAGIC
• Particle-acceleration timescales in TeV blazar flares
• Rapid TeV Flaring in Markarian 501
• On the rapid TeV flaring activity of Markarian 501
• The strange case of the transient HBL blazar 4FGL J1544.3-0649
• Modeling spectral lags in active galactic nucleus flares in the context of Lorentz invariance violation searches
• Modelling the $\gamma$-ray variability of 3C 273
• A Simple Method to Test for Energy-Dependent Dispersion in High Energy Light-Curves of Astrophysical Sources
• High-Energy gamma-ray Astronomy and String Theory
• Physics Insights from Recent MAGIC AGN Observations