Search for TeV $\gamma$ -rays from H1426+428 during 2004-07 with the TACTIC telescope
K.K. Yadav, R.C. Rannot, P. Chandra, A.K. Tickoo, S. Thoudam,, K.Venugopal, N. Bhatt, S. Bhattacharyya, K. Chanchalani, V.K. Dhar, S.V., Godambe, H.C. Goyal, M. Kothari, S. Kotwal, M.K. Koul, R. Koul,, S.Sahaynathan, M. Sharma

TL;DR
This study observed the BL Lac object H1426+428 with the TACTIC telescope over multiple years but did not detect significant TeV gamma-ray emission, setting an upper flux limit to inform future astrophysical models.
Contribution
First detailed multi-year TeV gamma-ray observations of H1426+428 with the TACTIC telescope resulting in flux upper limits rather than detection.
Findings
No statistically significant TeV gamma-ray signal detected.
Established an upper limit on gamma-ray flux at 3σ significance.
Results have implications for understanding EBL and AGN jet mechanisms.
Abstract
The BL Lac object H1426+428 () is an established source of TeV -rays and detections of these photons from this object also have important implications for estimating the Extragalactic Background Light (EBL) in addition to the understanding of the particle acceleration and -ray production mechanisms in the AGN jets. We have observed this source for about 244h in 2004, 2006 and 2007 with the TACTIC -ray telescope located at Mt. Abu, India. Detailed analysis of these data do not indicate the presence of any statistically significant TeV -ray signal from the source direction. Accordingly, we have placed an upper limit of on the integrated -ray flux at 3 significance level.
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