Spectral Variability Studies of Mrk 421 at TeV Energies

Details Spectral Variability Studies of Mrk 421 at TeV Energies Spectral Variability Studies of Mrk 421 at TeV Energies

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre11008k&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Mrk 421 exhibited unprecedented flaring activity between January - March 2001 at energies above 250 GeV. Mrk 421 is the second gamma-ray blazar (at z=0.03) showing a spectrum with an exponential cutoff above 4 TeV (Mrk 501 at 6 TeV), indicating that this may be due to the absorption of TeV photons by the intergalactic IR background. A better understanding of the intrinsic source spectra will help to determine the origin of the cutoffs and their relation to the IR background. Measurements of spectral variability make it possible to test gamma-ray emission models. We present the average energy spectrum and studies of spectral variability using data from the Whipple 10m gamma-ray telescope.

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