Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-03-25
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
The Extreme sky 2009: Sampling the Universe above 10 keV.
Scientific paper
We present the results of a deep spectral analysis of all Swift observations of Mrk 421 between April 2006 and July 2006, when it reached its highest X-ray flux recorded until the end of 2006. We completed this data set with other historical X-ray observations. We used the full data set to investigate the correlation between the spectral parameters. We found a signature of stochastic acceleration in the anticorrelation between the peak energy (Ep) of the spectral energy distribution (SED) and the spectral curvature parameter (b). We found signature of energetic budget of the jet in the correlation between the peak flux of the SED (S p) and Ep. Moreover, using simultaneous Swift UVOT/XRT/BAT data, we demonstrated, that during the strongest flares, the UV-to-X-ray emission from Mrk 421 requires that the curved electron distribution develops a low energy power-law tail. The observed spectral curvature and its anticorrelation with Ep is consistent with both stochastic acceleration or energy-dependent acceleration probability mechanisms, whereas the power-law slope of XRT-UVOT data is close to that inferred from the GRBs X-ray afterglow and in agreement with the universal first-order relativistic shock acceleration models. This scenario implies that magnetic turbulence may play a twofold role: spatial diffusion relevant to the first order process and momentum diffusion relevant to the second order process.
No associations
LandOfFree
The Large Flares of Mrk 421 in 2006: signature of electron acceleration and energetic budget of the jet does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Large Flares of Mrk 421 in 2006: signature of electron acceleration and energetic budget of the jet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Large Flares of Mrk 421 in 2006: signature of electron acceleration and energetic budget of the jet will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-181566