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| Paper: |
Thermal Non-jet Flares in Active Galactic Nuclei |
| Volume: |
427, Accretion and Ejection in AGN: a Global View |
| Page: |
118 |
| Authors: |
Tammi, J.; Hovatta, T. |
| Abstract: |
We present preliminary results of an ongoing study to test the
possibility of thermal flares caused by a collapsing accretion disk
in quasar/-microquasar objects. We use a simple toy model to
estimate the observable signatures of an event where the matter
originating from the disk expands rapidly and radiates mainly
bremsstrahlung radiation, thus leading to a short flare visible in
the optical waveband but not in radio. Together with the emergence
of a new jet component afterwards, this first flare forms a
double-peaked optical lightcurve with only one radio flare
coinciding with the latter optical burst – as observed e.g. in BL
Lac (Marscher et al. 2008). The same general picture is suspected to
work for example in the microquasar Cygnus X-3
(Miller-Jones et
al., in preparation) where it would lead
to double radio peaks. Apart from a few quantitative tests the
physical “big picture” is still mostly qualitative. |
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