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Observational evidence for the link between the variable optical continuum and the subparsec-scale jet of the radio galaxy 3C 390.3 | | T.G. Arshakian
; J. Leon-Tavares
; A.P. Lobanov
; V.H. Chavushyan
; A.I. Shapovalova
; A.N. Burenkov
; J.A. Zensus
; | | Date: |
15 Sep 2009 | | Abstract: | The mechanism and the region of generation of variable continuum emission are
poorly understood for radio-loud AGN because of a complexity of the nuclear
region. High-resolution radio VLBI (very long baseline interferometry)
observations allow zooming into a subparsec-scale region of the jet in the
radio-loud galaxy 3C 390.3. We combined the radio VLBI and the optical data
covering the time period of 14 years to look for a link between optical flares
and parsec-scale jet. We identify two stationary and nine moving radio features
in the innermost subparsec-scale region of the jet. We found a significant
correlation (at a confidence level of >99.99 %) between the ejected jet
components and optical continuum flares. The epochs at which the moving knots
pass through the location of a stationary radio feature and the optical light
curve reaches the maximum are correlated. The radio events follow the maxima of
optical flares with the mean time delay of 0.10 years. This correlation can be
understood if the variable optical continuum emission is generated in the
innermost part of the jet. A possible mechanism of the energy release is the
ejection of knots of high-energy electrons that are accelerated in the jet flow
and generate flares of synchrotron continuum emission in the wide range of
frequencies from radio to X-ray bands. In this scenario, the beamed optical
continuum emission from the jet and counterjet ionizes a gas in a
subrelativistic outflow surrounding the jet, which results in a formation of
two outflowing conical regions with broad emission lines (in addition to the
conventional broad line region around the central nucleus). | | Source: | arXiv, 0909.2679 | | Services: | Forum | Review | PDF | Favorites | |
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