July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Rapid variability at very high energies in Mrk 501

Jul 30, 2015, 3:30 PM
Mississippi Foyer (World Forum)

Mississippi Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 64
Poster contribution GA-EX Poster 1 GA


Dr Nachiketa Chakraborty (Max-Planck-Institut fuer Kernphysik)


Flaring states of the BL Lac object, Mrk 501 were observed by the High Energy Stereoscopic System (H.E.S.S.) during 2012 and 2014. Observations in 2014 recorded flux levels higher than one Crab unit and revealed rapid variability at very high energies ($\sim$ 2-20 TeV). The high statistics afforded by the flares allowed us to probe the presence of minutes timescale variability and study its statistical characteristics at purely TeV energies owing to the high threshold energy of approximately 2 TeV. Doubling times of a few minutes are estimated for fluxes, F(> 2 TeV). Statistical tests on the lightcurves show interesting temporal structure in the variations including deviations from a normal flux distribution similar to those found in the PKS 2155-⁠304 flare of July 2006, at nearly an order of magnitude higher threshold energy. Rapid variations at such high energies put strong constraints on the physical mechanisms in the blazar jet.
Collaboration H.E.S.S.
Registration number following "ICRC2015-I/" 928

Primary author

Dr Nachiketa Chakraborty (Max-Planck-Institut fuer Kernphysik)


Agnieszka Jacholkowska (LPHNE) Dr Andrew Taylor (Dublin Institute for Advanced Studies) Carlo Romoli (Dublin Institute for Advanced Studies) Dr Frank Rieger (Max-Planck-Institut fuer Kernphysik) Gabriele Cologna (Landessternwarte) Prof. Stefan Wagner (Landessternwarte Heidelberg)

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