Challenges to Models for Blazar Emission from X-ray and TeV Simultaneous Observations

Details Challenges to Models for Blazar Emission from X-ray and TeV Simultaneous Observations Challenges to Models for Blazar Emission from X-ray and TeV Simultaneous Observations

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.0748f&link_type=abstract

American Astronomical Society, HEAD meeting #9, #7.48; Bulletin of the American Astronomical Society, Vol. 38, p.357

Astronomy and Astrophysics

Astronomy

Scientific paper

Results from the week-long 2000 (BeppoSAX),
2001 (RXTE+HEGRA+Whipple), campaigns, and
shorter but uninterrupted Chandra
observations, depict a portrait of the
variability of Mrk421 that is challenging
several aspects of the "common-wisdom" SSC
model for emission and variability.
We observed strong variations in both bands,
which are highly correlated, with no
evidence of a non-zero X/TeV lags, nor
intraband X-ray lags.
During the best observed individual flares
the gamma-rays flux scales approximately
quadratically with X-ray flux.
Moreover, the flux-flux paths during the
outbursts decay follow closely those
traced in the rising phase.
The synchrotron peak energy correlates
very well with the luminosity, over the
course of several outbursts.
This finding may rule out the possibility
that the multiple flares observed during
the typical campaign can be modeled as
independent "shots", and seems to suggest
that in fact they are emitted by a
longer-lived "active region" of the jet.
The unprecedented view of the relationships
between X-ray and TeV fluxes and spectra
afforded by these campaigns, offers a
challenge for "mainstream" models, forcing
them to new level of detail in the
(time-dependent) representation of the
source, possibly also towards more
"exotic" physical conditions.

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