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, 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)
TL;DR
This paper reports on very-high-energy gamma-ray observations of two BL Lac objects using ground-based Cherenkov telescopes, providing flux upper limits due to non-detections.
Contribution
First measurements of very-high-energy gamma-ray flux upper limits for 1ES 1218+304 and H 1426+428 with the STACEE experiment.
Findings
No detections above 160 GeV for both sources.
Established 99% confidence level flux upper limits.
Confirmed these sources are very-high-energy gamma-ray emitters.
Abstract
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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