XMM-Newton timing mode observations of Mrk 421

Abstract

We present the results of a detailed temporal analysis of the bright BL Lac object Mrk 421 using the three available long timing mode observations by the EPIC PN camera. This detector mode is characterized by its long life time and is largely free of photon pile-up problems. The source was found in different intensity and variability states differing by up to more than a factor of three in count rate. A time resolved cross correlation analysis between the soft and hard energy bands revealed that the characteristics of the correlated emission, with lags of both signs, change on time scales of a few thousand seconds. Individual spectra, resolved on time scales of a few hundread seconds, can be quite well fitted by a broken power law. We find significant spectral variations on time scales as short as 500-1000 sec. Both the hard and the soft band spectral indices show a non-linear correlation with the source flux. A comparison of the observed light curves with numerical results from relativistic hydrodynamic computer simulations of the currently favored shock-in-jet models indicates that any determination of the jet's physical parameters from `simple' emission models must be regarded with caution: at any time we are seeing the emission from several emission regions distinct in space and time, which are connected by the complex hydrodynamic evolution of the non-uniform jet.

arXiv comment16 pages, 16 figures. Accepted for publication in A&A

References in corpus (19)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• Constraints on the Physical Parameters of TeV Blazars
• Internal shocks in the jets of radio-loud quasars
• Complex Spectral Variability from Intensive Multi-wavelength Monitoring of Mrk421 in 1998
• Variability Pattern and the Spectral Evolution of the BL Lacertae Object PKS 2155-304
• X-ray Emission of Mkn 421: New Clues From Its Spectral Evolution. II. Spectral Analysis and Physical Constraints
• Rapid X-ray Variability of the BL Lacertae Object PKS 2155-304
• X-ray Flaring Activity of Mrk 421
• Variability Time Scales of TeV Blazars Observed in the ASCA Continuous Long-Look X-ray Monitoring
• X-ray Emission of Mkn 421: New Clues From Its Spectral Evolution. I. Temporal Analysis
• Observing Mkn 421 with XMM--Newton: the EPIC--PN point of view
• High Temporal Resolution XMM Monitoring of PKS 2155-304
• Synthetic X-ray light curves of BL Lacs from relativistic hydrodynamic simulations
• XMM - Newton observations of Markarian 421
• Complex X-ray spectral variability in Mkn 421 observed with XMM-Newton
• The 0.1-100 keV spectral shape and variability of Mkn421 in high state
• X-ray Variability of Blazars
• The Effects of Periodically Gapped Time Series on Cross-correlation Lag Determinations
• Four Years of Extreme Ultraviolet Observations of Markarian 421: II. Temporal Analysis

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