The GeV-band variability of Mrk 421

Journal
Date Issued
2017
Author(s)
Kapanadze, B.
•
Dorner, D.
•
•
•
Kapanadze, S.
•
Tabagari, L.
DOI
Abstract
The TV-detected blazar Markarian 421 is the brightest high-energy peaked BL Lac (HBL) source in the GeV energy range, detectable with 3 sigma significance on daily timescales in medium and higher brightness states with Large Area Telescope onboard Fermi. The 0.3-300 GeV flux showed a strong variability on diverse time scales from the flares lasting a few weeks down to intraday flux fluctuations detected mostly in the flaring states. The source also exhibited a GeV spectral variability. We mostly observe a low spectral curvature in this band due to the presence of the Inverse Compton peak at the energies mainly beyond about 100 GeV. The GeV flux generally showed a significantly stronger correlation with the radio-UV fluxes than with those in the X-ray and TeV bands that confirms the hypothesis about the possible stronger connection between radio-UV and GeV emissions due the effect of Klein-Nishina suppression on the IC process, leading to the effective up-scattering of radio-UV photons at the GeV energies by the X-ray emitting electrons.

Coverage
HIGH ENERGY GAMMA-RAY ASTRONOMY: 6th International Symposium on High Energy Gamma-Ray Astronomy
Volume
1792
Issue
1
Start page
050021
Conferenece
6th International Symposium on High Energy Gamma-Ray Astronomy
Conferenece place
Heidelberg
Conferenece date
July 11-15, 2016
Uri
Url
Issn Identifier
0094-243X
Ads BibCode
2017AIPC.1792e0021K
Rights
open.access
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