Multiwavelength study of TeV Blazar Mrk421 during giant flare

Abstract

Context: The nearby (z=0.031) TeV blazar Mrk421 was reported to be in a high state of flux activity since November, 2009. Aims: To investigate possible changes in the physical parameters of Mrk421 during its high state of activity using multiwavelength data. Methods: We have observed this source in bright state using High Altitude GAmma Ray (HAGAR) telescope array at energies above 250 GeV during February 13 - 19, 2010. Optical, X-ray and gamma-ray archival data are also used to obtain the SEDs and light curves. Results: Mrk421 was found to undergo one of its brightest flaring episodes on February 17, 2010 by various observations in X-rays and gamma-rays. HAGAR observations during February 13 - 19, 2010 at the energies above 250 GeV show an enhancement in the flux level, with a maximum flux of ~ 7 Crab units being detected on February 17, 2010. We present the spectral energy distributions during this flaring episode and investigate the correlation of the variability in X-ray and gamma-ray bands. Conclusions: Our multiwavelength study suggests that the flare detected during February 16 and 17, 2010 could arise due to a passing shock in the jet.

9 pages, 10 figures, Accepted for publication in Astronomy and Astrophysics (A & A)

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• Fermi-LAT Observations of Markarian 421: the Missing Piece of its Spectral Energy Distribution
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• Fermi Gamma-ray Space Telescope Observations of the Gamma-ray Outburst from 3C 454.3 in November 2010
• Observations of Mkn 421 with the MAGIC Telescope
• Unveiling the X-ray/TeV engine in Mkn 421
• Long-term lightcurves from combined unified very high energy $\gamma$-ray data
• Bright X-ray flares from the BL Lac object Mrk 421, detected with MAXI in 2010 January and February
• Observations of TeV gamma-rays from Mrk 421 during Dec. 2005 to Apr. 2006 with the TACTIC telescope
• Observations of AGNs using PACT

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• The Great Markarian 421 Flare of February 2010: Multiwavelength variability and correlation studies
• Tests of the Einstein Equivalence Principle using TeV Blazars
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• The TeV blazar Markarian 421 at the highest spatial resolution
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• Testing one-zone synchrotron-self-Compton models with spectral energy distributions of Mrk 421
• Time dependent spectral modeling of Markarian 421 during a violent outburst in 2010
• Understanding the X-ray spectral curvature of Mkn 421 using broadband AstroSat observations
• A time dependent approach to model X-ray and $\gamma$--ray light curves of Mrk 421 observed during the flare in February 2010
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• Galactic and Extragalactic Sources of Very High Energy Gamma-rays
• Dynamic changes of emitting electron distribution in the jet of 3C 279: signatures of acceleration and cooling
• Multi-wavelength study of Mrk 421 TeV flare observed with \emph{TACTIC} telescope in February 2010
• Optical polarization properties of February 2010 outburst of the blazar Mrk 421
• Study of short term enhanced TeV $\gamma$- ray emission from Mrk 421 observed with TACTIC on December 28, 2014
• Variations of the physical parameters of the blazar Mrk 421 based on the analysis of the spectral energy distributions
• Flux and spectral variability of Mrk 421 during its moderate activity state using NuSTAR: Possible accretion disc contribution?
• VHE Gamma-ray Observation of Crab Nebula with HAGAR Telescope Array
• Properties and Possible Physical Origins of $\gamma$-ray Emission in Extreme Synchrotron Blazars