Very high energy γ-ray observations of Mrk 501 using the TACTIC imaging γ-ray telescope during 2005-06

S. V. Godambe, R. C. Rannot, P. Chandra, K. K. Yadav, A. K. Tickoo, K. Venugopal, N. Bhatt, S. Bhattacharyya, K. Chanchalani, V. K. Dhar, H. C. Goyal, R. K. Kaul, M. Kothari, S. Kotwal, M. K. Koul, R. Koul, B. S. Sahaynathan, M. Sharma, S. Thoudam

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Abstract

In this paper we report on the Markarian 501 results obtained during our TeV γ-ray observations from 11 March to 12 May 2005 and 28 February to 7 May 2006 for 112.5 h with the TACTIC γ-ray telescope. During 2005 observations for 45.7 h, the source was found to be in a low state and we have placed an upper limit of 4.62 × 10-12 photons cm-2 s-1 at 3σ level on the integrated TeV γ-ray flux above 1 TeV from the source direction. However, during 2006 observations for 66.8 h, detailed data analysis revealed the presence of a TeV γ-ray signal from the source with a statistical significance of 7.5σ above E γ≥ 1 TeV. The time-averaged differential energy spectrum of the source in the energy range 1-11 TeV is found to match well with the power-law function of the form (dΦ/dE = f0E) with f0 = (1.66 0.52) × 10-11 cm-2 s -1 TeV-1 and Γ = 2.80 0.27.

Original languageBritish English
Article number065202
JournalJournal of Physics G: Nuclear and Particle Physics
Volume35
Issue number6
DOIs
StatePublished - 1 Jun 2008

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