Very high-energy observations of the two high-frequency peaked BL Lac objects 1ES 1218+304 and H 1426+428

C. Mueller , N. Akhter , J. Ball , D.A. Bramel , J. Carson , C.E. Covault , D. Driscoll , P. Fortin

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D.M. Gingrich D.S. Hanna A. Jarvis J. Kildea T. Lindner R. Mukherjee R.A. Ong K. Ragan R.A. Scalzo D.A. Williams J. Zweerink (The STACEE Collaboration)

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classification 🌌 astro-ph.HE hep-ex

keywords observationscherenkovgamma-rayobjectssourcesstaceevery-high-energyabove

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We present results of very-high-energy gamma-ray observations (E > 160 GeV) of two high-frequency-peaked BL Lac (HBL) objects, 1ES 1218+304 and H 1426+428, with the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE). Both sources are very-high-energy gamma-ray emitters above 100 GeV, detected using ground-based Cherenkov telescopes. STACEE observations of 1ES 1218+304 and H 1426+428 did not produce detections; we present 99% CL flux upper limits for both sources, assuming spectral indices measured mostly at higher energies.

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Very high-energy observations of the two high-frequency peaked BL Lac objects 1ES 1218+304 and H 1426+428

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