Observations of TeV γ-rays from Mrk 421 during December 2005 to April 2006 with the TACTIC telescope

The TACTIC γ-ray telescope has observed Mrk 421 on 66 clear nights from December 07, 2005 to April 30, 2006, totalling ∼202 h of on-source observations. Here, we report the detection of flaring activity from the source at ⩾1 TeV energy and the time-averaged differential γ-ray spectrum in the energy range 1–11 TeV for the data taken between December 27, 2005 and February 07, 2006 when the source was in a relatively higher state as compared to the rest of the observation period. Analysis of this data spell, comprising ∼97 h reveals the presence of a ∼12.0σ γ-ray signal with daily flux of >1 Crab unit on several days. A pure power law spectrum with exponent −3.11 ± 0.11 as well as a power law spectrum with an exponential cutoff (Γ = −2.51 ± 0.26 and E0 = (4.7 ± 2.1) TeV) are found to provide reasonable fits to the inferred differential spectrum within statistical uncertainties. We believe that the TeV light curve presented here, for nearly 5 months of extensive coverage, as well as the spectral information at γ-ray energies of >5 TeV provide a useful input for other groups working in the field of γ-ray astronomy.

Chandra, P.Bhabha Atomic Research Centre, India (författare)
Tickoo, A. K.Bhabha Atomic Research Centre, India (författare)
Rannot, R. C.Bhabha Atomic Research Centre, India (författare)
Godambe, S.Bhabha Atomic Research Centre, India (författare)
Koul, M. K.Bhabha Atomic Research Centre, India (författare)
Dhar, V. K.Bhabha Atomic Research Centre, India (författare)
Thoudam, SatyendraBhabha Atomic Research Centre, India(Swepub:lnu)sathaa (författare)
Bhatt, N.Bhabha Atomic Research Centre, India (författare)
Bhattacharyya, S.Bhabha Atomic Research Centre, India (författare)
Chanchalani, K.Bhabha Atomic Research Centre, India (författare)
Goyal, H. C.Bhabha Atomic Research Centre, India (författare)
Kaul, R. K.Bhabha Atomic Research Centre, India (författare)
Kothari, M.Bhabha Atomic Research Centre, India (författare)
Kotwal, S.Bhabha Atomic Research Centre, India (författare)
Koul, R.Bhabha Atomic Research Centre, India (författare)
Sahayanathan, S.Bhabha Atomic Research Centre, India (författare)
Sharma, M.Bhabha Atomic Research Centre, India (författare)
Venugopal, K.Bhabha Atomic Research Centre, India (författare)
Bhabha Atomic Research Centre, India (creator_code:org_t)

Av författaren/redakt...: Yadav, K. K.; Chandra, P.; Tickoo, A. K.; Rannot, R. C.; Godambe, S.; Koul, M. K.; visa fler...; Dhar, V. K.; Thoudam, Satyend ...; Bhatt, N.; Bhattacharyya, S ...; Chanchalani, K.; Goyal, H. C.; Kaul, R. K.; Kothari, M.; Kotwal, S.; Koul, R.; Sahayanathan, S.; Sharma, M.; Venugopal, K.; visa färre...

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