Simultaneous Multiwavelength Observations of Markarian 421 During Outburst

Abstract

We report on the results of two coordinated multiwavelength campaigns that focused on the blazar Markarian 421 during its 2006 and 2008 outbursts. These campaigns obtained UV and X-ray data using the XMM-Newton satellite, while the gamma-ray data were obtained utilizing three imaging atmospheric Cerenkov telescopes, the Whipple 10m telescope and VERITAS, both based in Arizona, as well as the MAGIC telescope, based on La Palma in the Canary Islands. The coordinated effort between the gamma-ray groups allowed for truly simultaneous data in UV/X-ray/gamma-ray wavelengths during a significant portion of the XMM-Newton observations. This simultaneous coverage allowed for a reliable search for correlations between UV, X-ray and gamma-ray variability over the course of the observations. Investigations of spectral hysteresis and modeling of the spectral energy distributions are also presented.

27 pages, 5 figures, Accepted for publication in The Astrophysical Journal

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Cited by in corpus (41)

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• Limits on axion-like particles from Mrk 421 with 4.5-year period observations by ARGO-YBJ and Fermi-LAT
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• Long-term study of Mkn 421 with the HAGAR Array of Telescopes
• Time-Dependent Searches for Point Sources of Neutrinos with the 40-String and 22-String Configurations of IceCube
• Long-term multi-wavelength variability and correlation study of Markarian 421 from 2007 to 2009
• Long-term optical polarization variability and multiwavelength analysis of Blazar Mrk 421
• Long term observations of B2 1215+30 with VERITAS
• Broad Ly alpha Emission from Three Nearby BL Lacertae Objects
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• An active state of the BL Lac Object Markarian 421 detected by INTEGRAL in April 2013
• Systematic investigation of X-ray spectral variability of TeV blazars during flares in the $RXTE$ era
• Extremely rapid x-ray flares of tev blazars in the rxte era
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• The experimental challenge of detecting solar axion-like particles to test cosmological ALP-photon oscillation hypothesis
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• Understanding the X-ray spectral curvature of Mkn 421 using broadband AstroSat observations
• TeV Gamma-ray Observations of Markarian 421 using TACTIC during 2009-10
• Galactic and Extragalactic Sources of Very High Energy Gamma-rays
• Multi-wavelength study of Mrk 421 TeV flare observed with \emph{TACTIC} telescope in February 2010
• Relevance of VHE Blazar Spectra Models with Axion-Like Particles
• Do radiative losses determine the characteristic emission of the blazar Mkn 421?
• Reconcilement of VHE $\gamma$-ray/X-ray correlation studies in Mrk 421 and break-down at high fluxes
• An Angle Dependent SSC Model for Relativistic Jet Sources
• The `blazar sequence' in TeV band
• Photon and neutrino emission from active galactic nuclei
• Infrared emission from dust and the spectral features of extragalactic gamma-ray sources
• Prospects of additional contribution at Optical-NIR band of EBL in the light of VHE spectra
• Simultaneously unveiling the EBL and intrinsic spectral parameters of gamma-ray sources with Hamiltonian Monte Carlo
• X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304