Detection of Gamma Rays with E > 300 GeV from Markarian 501

Details Detection of Gamma Rays with E > 300 GeV from Markarian 501 Detection of Gamma Rays with E > 300 GeV from Markarian 501

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456l..83q&link_type=abstract

Astrophysical Journal Letters v.456, p.L83

Astronomy and Astrophysics

Astronomy

313

Galaxies: Bl Lacertae Objects: Individual Name: Markarian 501, Gamma Rays: Observations

Scientific paper

The detection of gamma rays of energy greater than 300 GeV from the BL Lacertae object Mrk 501 demonstrates that extragalactic TeV emission is not unique to Mrk 421. During 66 hr of observations between 1995 March and July we measured an average flux of 8.1 +/- 1.4 x 10-12 cm-2 s-1 above 300 GeV, a flux that is only 20% of the average Mrk 421 flux. The new gamma-ray source has not been reported by the Compton Gamma Ray Observatory as an emitter of gamma rays at lower energies. There is evidence for variability on timescales of days.

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