Search for TeV $γ$ -rays from H1426+428 during 2004-07 with the TACTIC telescope

Details Search for TeV $γ$ -rays from H1426+428 during 2004-07 with the TACTIC telescope Search for TeV $γ$ -rays from H1426+428 during 2004-07 with the TACTIC telescope

2009-05-25

arxiv.org/abs/0905.3994v1

J.Phys.G36:085201,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages, 5 figures accepted for publication in Journal of Physics G: Nuclear and Particle Physics

Scientific paper

10.1088/0954-3899/36/8/085201

The BL Lac object H1426+428 ($z\equiv 0.129$) is an established source of TeV $\gamma$-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 $\gamma$-ray production mechanisms in the AGN jets. We have observed this source for about 244h in 2004, 2006 and 2007 with the TACTIC $\gamma$-ray telescope located at Mt. Abu, India. Detailed analysis of these data do not indicate the presence of any statistically significant TeV $\gamma$-ray signal from the source direction. Accordingly, we have placed an upper limit of $\leq1.18\times10^{-12}$ $photons$ $cm^{-2}$ $s^{-1}$ on the integrated $\gamma$-ray flux at 3$\sigma$ significance level.

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