Gamma-Ray Variability of the BL Lacertae Object Markarian 421

Astronomy and Astrophysics – Astronomy

Scientific paper

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Gamma Rays: Observations, Galaxies: Bl Lacertae Objects: Individual Name: Markarian 421

Scientific paper

We report on the gamma -ray variability of Mrk 421 at E gamma > 300 GeV during the 1995 season, and concentrate on the results of an intense multiwavelength observing campaign in the period April 20 to May 5, which included >100 MeV gamma -ray, X-ray, extreme-ultraviolet, optical, and radio observations, some of which show evidence for correlated behavior. Rapid variations in the TeV gamma -ray light curve with doubling and decay times of <~1 day require a compact emission region and significant Doppler boosting. The TeV data reveal that the gamma -ray emission is best characterized by a succession of rapid flares with a relatively low baseline level of steady emission.

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