Measurement of the flux, spectrum, and variability of TeV γ-rays from MKN 501 during a state of high activity.

Details Measurement of the flux, spectrum, and variability of TeV γ-rays from MKN 501 during a state of high activity. Measurement of the flux, spectrum, and variability of TeV γ-rays from MKN 501 during a state of high activity.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327l...5a&link_type=abstract

Astronomy and Astrophysics, v.327, p.L5-L8

Astronomy and Astrophysics

Astrophysics

82

Gamma Rays: Observations, Bl Lacertae Objects: Individual: Mkn 501

Scientific paper

Between March 16, 1997 and April 14, 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging Cherenkov telescopes. The flux level varied during this period from about one half up to six times the flux observed from the Crab Nebula. Changes of the detection rate by a factor of up to 4 within 1 day have been observed. The measured differential energy spectrum of the radiation follows a power law from 1 TeV to 10 TeV. The differential spectral index of 2.47+/-0.07+/-0.25 is close to that of the Crab Nebula of 2.66+/-0.12+/-0.25.

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