Detection of TeV gamma rays from the BL Lacertae object 1ES 1959+650 with the Whipple 10 meter telescope

Published in:

Astrophysical Journal 583,1 (2003) L9-L12;


We present the first strong detection of very high energy gamma-rays from the close (z=0.048) X-ray-selected BL Lacertae object 1ES 1959+650. Observations were made with the Whipple 10 m telescope on Mount Hopkins, Arizona, using the atmospheric Cerenkov imaging technique. The flux between 2002 May and July was highly variable, with a mean of 0.64+/-0.03 times the steady flux from the Crab Nebula and reaching a maximum of 5 crab, with variability on timescales as short as 7 hr.


bl lacertae objects : individual (1es 1959+650);; gamma rays : observations;; active galaxy markarian-421;; x-ray;; energy-spectrum;; strong flares;; radiation;; mkn-501;; blazars;; photons;; system

Date of this Version

January 2003

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