Tev Observations of the Variability and Spectrum of Markarian 421

Details Tev Observations of the Variability and Spectrum of Markarian 421 Tev Observations of the Variability and Spectrum of Markarian 421

1997-06-13

arxiv.org/abs/astro-ph/9706125v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures, to appear in proceedings of 25 ICRC (Durban)

Scientific paper

Markarian 421 was the first extragalactic source to be detected with high statistical certainty at TeV energies. The Whipple Observatory gamma-ray telescope has been used to observe the Active Galactic Nucleus, Markarian 421 in 1996 and 1997. The rapid variability observed in TeV gamma rays in previous years is confirmed. Doubling times as short as 15 minutes are reported with flux levels reaching 15 photons per minute. The TeV energy spectrum is derived using two independent methods. The implications for the intergalactic infra-red medium of an observed unbroken power law spectrum up to energies of 5 TeV is discussed.

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