TeV Gamma-ray Observations of Markarian 421 using TACTIC during 2009-10

Abstract

We have observed the blazar Markarian 421 with the TACTIC $\gamma$-ray telescope at Mt. Abu, India, from 22 November 2009 to 16 May 2010 for 265 hours. Detailed analysis of the data so recorded revealed presence of a TeV $\gamma$-ray signal with a statistical significance of 12.12$\sigma$ at $E_{\gamma }\ge$ 1 TeV. We have estimated the time averaged differential energy spectrum of the source in the energy range 1.0 - 16.44 TeV. The spectrum fits well with the power law function of the form ($dF/dE=f_0{E}^{-\Gamma }$) with $f_0=(1.39\pm 0.239)\times 10^{-11}c{m}^{-2}{s}^{-1}Te{V}^{-1}$ and $\Gamma =2.31\pm 0.14$.

15 pages, 7 figures: Accepted for publication in J. Phys. G: Nucl. Part. Phys

References in corpus (13)

• Observations of the Crab Nebula with H.E.S.S
• VHE Gamma-Ray Observation of the Crab Nebula and its Pulsar with the MAGIC telescope
• Observations of Mkn 421 with the MAGIC Telescope
• GeV Gamma-Ray Attenuation and the High-Redshift UV Background
• Long-term monitoring of the TeV emission from Mrk 421 with the ARGO-YBJ experiment
• Simultaneous Multiwavelength Observations of Markarian 421 During Outburst
• Corrected Table for the Parametric Coefficients for the Optical Depth of the Universe to Gamma-rays at Various Redshifts
• The TACTIC atmospheric Cherenkov Imaging telescope
• MAGIC TeV Gamma-Ray Observations of Markarian 421 during Multiwavelength Campaigns in 2006
• Observations of TeV gamma-rays from Mrk 421 during Dec. 2005 to Apr. 2006 with the TACTIC telescope
• Mrk 421, Mrk 501, and 1ES 1426+428 at 100 GeV with the CELESTE Cherenkov Telescope
• ANN-based energy reconstruction procedure for TACTIC gamma-ray telescope and its comparison with other conventional methods
• Simulation studies for optimizing the trigger generation criteria for the TACTIC telescope

Cited by in corpus (9)

• The extragalactic background light, the Hubble constant, and anomalies: conclusions from 20 years of TeV gamma-ray observations
• Improved limits on Lorentz invariance violation from astrophysical gamma-ray sources
• Time dependent spectral modeling of Markarian 421 during a violent outburst in 2010
• A time dependent approach to model X-ray and $\gamma$--ray light curves of Mrk 421 observed during the flare in February 2010
• Multi-wavelength study of Mrk 421 TeV flare observed with \emph{TACTIC} telescope in February 2010
• Study of short term enhanced TeV $\gamma$- ray emission from Mrk 421 observed with TACTIC on December 28, 2014
• Artificial Neural Network based gamma-hadron segregation methodology for TACTIC telescope
• Exploring TeV candidates of Fermi blazars through machine learning
• Monitoring the Extragalactic High Energy Sky