Observations of TeV gamma-rays from Mrk 421 during Dec. 2005 to Apr. 2006 with the TACTIC telescope

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dc.creatorYadav, K. K.
dc.creatorChandra, P.
dc.creatorTickoo, A. K.
dc.creatorRannot, R. C.
dc.creatorGodambe, S.
dc.creatorKoul, M. K.
dc.creatorDhar, V. K.
dc.creatorThoudam, S.
dc.creatorBhatt, N.
dc.creatorBhattacharyya, S.
dc.creatorChanchalani, K.
dc.creatorGoyal, H. C.
dc.creatorKaul, R. K.
dc.creatorKothari, M.
dc.creatorKotwal, S.
dc.creatorKoul, R.
dc.creatorSahayanathan, S.
dc.creatorSharma, M.
dc.creatorVenugopal, K.
dc.date2007-01-31
dc.date.accessioned2026-07-07T11:21:03Z
dc.date.available2026-07-07T11:21:03Z
dc.descriptionThe TACTIC $γ$-ray telescope has observed Mrk 421 on 66 clear nights from Dec. 07, 2005 to Apr. 30, 2006, totalling $\sim$ 202 hours of on-source observations. Here, we report the detection of flaring activity from the source at $\geq$ 1 TeV energy and the time-averaged differential $γ$-ray spectrum in the energy range 1-11 TeV for the data taken between Dec. 27, 2005 to Feb. 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 about $\sim$97h reveals the presence of a $\sim 12.0 σ$ $γ$-ray signal with daily flux of $>$ 1 Crab unit on several days. A pure power law spectrum with exponent $-3.11\pm0.11$ as well as a power law spectrum with an exponential cutoff $(Γ= -2.51\pm0.26$ and $E_0=(4.7\pm2.1) TeV)$ 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.
dc.description13pages,4figures; Accepted for publication in Astroparticle Physics
dc.identifierhttps://arxiv.org/abs/astro-ph/0701890
dc.identifierhttp://arxiv.org/abs/astro-ph/0701890
dc.identifierAstropart.Phys.27:447-454,2007
dc.identifierdoi:10.1016/j.astropartphys.2007.01.005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194150
dc.subjectAstrophysics
dc.titleObservations of TeV gamma-rays from Mrk 421 during Dec. 2005 to Apr. 2006 with the TACTIC telescope
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