Search for TeV γ-rays from H1426+428 during 2004-2007 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

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8 Scopus citations


The BL Lac object H1426+428 (z ≡ 0.129) is an established source of TeV γ-rays and detections of these photons from this object also have important implications for estimating the extragalactic background light in addition to the understanding of the particle acceleration and γ-ray production mechanisms in the AGN jets. We have observed this source for about 244 h in 2004, 2006 and 2007 with the TACTIC γ-ray telescope located at Mt Abu, India. Detailed analysis of these data do not indicate the presence of any statistically significant TeV γ-ray signal from the source direction. Accordingly, we have placed an upper limit of ≤1.18 × 10-12 photons cm-2 s-1 on the integrated γ-ray flux at 3σ significance level.

Original languageBritish English
Article number085201
JournalJournal of Physics G: Nuclear and Particle Physics
Issue number8
StatePublished - 2009


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