Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21323502f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #235.02; Bulletin of the American Astronomical Society, Vol. 41, p.508
Astronomy and Astrophysics
Astronomy
Scientific paper
Over the last 10 years Mrk 421 has been the target of several multiwavelength campaigns, with special emphasis on X-ray and TeV variability, with a variety of observing strategies and duration.
The characteristics of the variability shown by Mrk 421, in terms of typical flaring timescales and amplitudes, and very fortunate matching of its SED components and peaks with the bandpasses of X-ray and TeV telescopes, makes it a unique object for investigating the phenomenology of the emission from AGN relativistic jets.
In general, these campaigns showed that X-ray and gamma-ray luminosites vary together and there is certainly a loose correlation, broadly supporting the fiducial mainstream models. However, the unprecedented details afforded by some datasets also raised new questions, challenging some long-held ideas/assumptions about the physical properties of the emission region(s) in the jet, possibly requiring more "exotic" conditions. Certainly time-dependent, multi-zone models are necessary to interpret these observations, whose details now exceed the capabilities of simpler "baseline" models.
I am going to review some of the most intriguing observational findings of the longest/better sampled campaigns, focusing on X/TeV spectral and brightness variability, but also illustrating some of the X-ray results because in this band we can achieve a better sampling and level of detail that provides an important context to the simultaneous X/TeV data. Among the issues reviewed, the puzzling situation with respect to intra- and inter-band lags, the details of the X/TeV flux correlation (its slope and evolution) or occasional lack of it, the temporal variation of the synchrotron peak energy and its correlation with the source luminosity, and the constraints and the clues they provide.
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