Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..455s&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc
Astronomy and Astrophysics
Astronomy
2
Gamma-Ray, Galactic Nuclei, Circumnuclear Matter, And Bulges, Black Holes
Scientific paper
From January to April 2001 the active galactic nucleus Markarian 421 showed a persistent high-flux state and frequent flares with unprecedentedly rapid rise and fall times in the very-high energy domain. We analyze the flare rise and fall times in a large 56-night data sample with rather large statistics obtained with the HEGRA telescope CT1. A fine time-structure analysis reveals typical rise and fall doubling times of about 20-30 minutes. The shortest detected rise and fall doubling times are 10-15 minutes. The central black-hole mass of Mkn 421 implies that this rapid variability cannot be explained by objects moving around its last stable orbit.
Lorenz Eckart
Schweizer Thomas
Wagner Robert
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