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The AGN dance: astrometric variability as the result of supernova explosions in nuclear
 

Summary: The AGN dance: astrometric variability as
the result of supernova explosions in nuclear
starbursts.
Jorge Melnick 1 , Itziar Aretxaga 2 , and Roberto Terlevich 2
1 European Southern Observatory, La Silla, Chile
2 Royal Greenwich Observatory, Cambridge, UK
Abstract. The starburst model of AGN predicts the supernova rates in the nuclear
star clusters of low luminosity AGN to be less than one per year. The compact remnants
of these explosions evolve in regions of very high density and thus radiate most of
the energy in less than one year. Statistically, therefore, no more than one compact
supernova remnant is expected to be active at any given time. The broad line region
in the starburst model is produced in the compact supernova remnants so, for low
luminosity objects, the BLR will typically consist of only one compact remnant.
Thus, a strong prediction of the model is that the BLR of low luminosity AGN
should move at random with a typical step which depends on the luminosity of the
nucleus. We call this motion the AGN dance.
1 AGN variability
One of the most powerful probes into the inner realms of AGN is their photo­
metric variability which is observed to occur over a wide range of time scales
and luminosities ranging from fast, low amplitude, flickering in X­rays on scales

  

Source: Aretxaga, Itziar - Instituto Nacional de Astrofísica Óptica y Electrónica

 

Collections: Physics