INTEGRAL observations of the blazar Mrk 421 in outburst (Results of a multi-wavelength campaign)

Abstract

We report the results of a multi-wavelength campaign on the blazar Mrk 421 during outburst. We observed four strong flares at X-ray energies that were not seen at other wavelengths (partially because of missing data). From the fastest rise in the X-rays, an upper limit could be derived on the extension of the emission region. A time lag between high-energy and low-energy X-rays was observed, which allowed an estimation of the magnetic-field strength. The spectral analysis of the X-rays revealed a slight spectral hardening of the low-energy (3 - 43 keV) spectral index. The hardness-ratio analysis of the Swift-XRT (0.2 - 10 keV) data indicated a small correlation with the intensity; i. e., a hard-to-soft evolution was observed. At the energies of IBIS/ISGRI (20 - 150 keV), such correlations are less obvious. A multiwavelength spectrum was composed and the X-ray and bolometric luminosities are calculated.

arXiv comment15 pages, 18 figures; accepted by Astronomy & Astrophysics

References in corpus (38)

• The Swift X-ray Telescope
• First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
• BL Lac Objects in the Synchrotron Proton Blazar Model
• Structured jets in TeV BL Lac objects and radiogalaxies
• TeV Gamma Rays from BL Lac Objects due to Synchrotron Radiation of Extremely High Energy Protons
• Constraints on the Physical Parameters of TeV Blazars
• A Proton Synchrotron Blazar Model for Flaring in Markarian~501
• Multiwavelength Observations of Strong Flares From the TeV-Blazar 1ES 1959+650
• Log-parabolic spectra and particle acceleration in the BL Lac object Mkn 421: spectral analysis of the complete BeppoSAX wide band X-ray data set
• A Multi-wavelength View of the TeV Blazar Markarian 421: Correlated Variability, Flaring, and Spectral Evolution
• Multiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/TeV Correlated Variability
• Decelerating Flows in TeV Blazars: A Resolution to the BL Lac -- FR I Unification Problem
• Multiwavelength Observations of a Flare from Markarian 501
• Host galaxy subtraction of TeV candidate BL Lacertae objects
• Modelling the TeV gamma-ray spectra of two low redshift AGNs: Mkn 501 and Mkn 421
• Variations of the TeV energy spectrum at different flux levels of Mkn 421 observed with the HEGRA system of Cherenkov telescopes
• Variability Pattern and the Spectral Evolution of the BL Lacertae Object PKS 2155-304
• The Black Hole Masses and Host Galaxies of BL Lac Objects
• Energetics of Tev Blazars and Physical Constraints on their Emission Regions
• Simultaneous X-Ray and TeV Gamma-Ray Observations of the TeV Blazar Markarian 421 during February and May 2000
• Detection of the BL Lac Object H1426+428 at TeV Gamma Ray Energies
• The black hole mass of BL Lac objects from the stellar velocity dispersion of the host galaxy
• Observations of Mkn 421 in 2004 with H.E.S.S. at large zenith angles
• X-ray Emission of Mkn 421: New Clues From Its Spectral Evolution. I. Temporal Analysis
• Correlated intense X-ray and TeV activity of Mrk~501 in 1998 June
• Observing Mkn 421 with XMM--Newton: the EPIC--PN point of view
• Spectral Evolution of PKS 2155-304 observed with BeppoSAX during an Active Gamma-ray Phase
• Cutoff in the TeV Energy Spectrum of Markarian 421 During Strong Flares in 2001
• The bulk Lorentz factor crisis of TeV blazars : evidence for an inhomogeneous pileup energy distribution ?
• Unveiling the X-ray/TeV engine in Mkn 421
• Multiwavelength Observations of the Blazar Mrk 421 in December 2002 and January 2003
• XMM-Newton timing mode observations of Mrk 421
• VLBA Polarization Observations of Markarian 421 After a Gamma-Ray High State
• BAT X-ray Survey - I: Methodology and X-ray Identification
• The Duration -- Photon Energy Relation of Gamma Ray Bursts and Its Interpretations
• Complex X-ray spectral variability in Mkn 421 observed with XMM-Newton
• Simultaneous radio-interferometric and high-energy TeV observations of the gamma-ray blazar Mkn 421
• INTEGRAL and Multiwavelength Observations of the Blazar Mrk 421 during an Active Phase

Cited by in corpus (33)

• Active Galactic Nuclei: what's in a name?
• Science with e-ASTROGAM (A space mission for MeV-GeV gamma-ray astrophysics)
• TeV and Multi-wavelength Observations of Mrk 421 in 2006-2008
• Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013
• Long-term optical monitoring of TeV emitting Blazars
• VHE gamma-ray emission of PKS 2155-304: spectral and temporal variability
• The June 2008 flare of Markarian 421 from optical to TeV energies
• Long-term variability of AGN at hard X-rays
• Optical Flux and Spectral Variability of Blazars
• Multiwavelength Variability of the Blazars Mrk 421 and 3C 454.3 in the High-State
• Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017
• Long-term study of Mkn 421 with the HAGAR Array of Telescopes
• MAGIC TeV Gamma-Ray Observations of Markarian 421 during Multiwavelength Campaigns in 2006
• Long-term variability of radio-bright BL Lacertae objects
• The Simultaneous Low State Spectral Energy Distribution of 1ES 2344+514 from Radio to Very High Energies
• Suzaku Wide Band Analysis of the X-ray Variability of TeV Blazar Mrk 421 in 2006
• Study of underlying particle spectrum during huge X-ray flare of Mkn 421 in April 2013
• An active state of the BL Lac Object Markarian 421 detected by INTEGRAL in April 2013
• Multi-wavelength study of flaring activity in HBL 1ES 1959+650 during 2015-16
• INTEGRAL view of AGN
• X-ray intraday variability of the TeV blazar Mrk 421 with {\it XMM-Newton}
• Understanding the X-ray spectral curvature of Mkn 421 using broadband AstroSat observations
• Possible Detection of Apparent Superluminal inward motion in Markarian 421 after the Giant X-ray flare in February, 2010
• The Fermi/LAT sky as seen by INTEGRAL/IBIS
• Rapid X-ray Variability in Mkn 421 during a Multiwavelength Campaign
• Study of short term enhanced TeV $\gamma$- ray emission from Mrk 421 observed with TACTIC on December 28, 2014
• The nature of the multi-wavelength emission of 3C 111
• Correlated Short-Timescale Hard-Soft X-ray Variability of the Blazars Mrk 421 and 1ES 1959+650 using $\text{AstroSat}$
• Long-term hard X-ray variability properties of Swift-BAT blazars
• Connection Between Optical and VHE Gamma-ray Emission in Blazar Jets
• Multiwavelength Observations of Markarian 421 in 2005 - 2006
• Investigating the variability of Swift-BAT blazars with NICER
• X-ray Flux and Spectral Variability of the TeV Blazars Mrk 421 and PKS 2155-304