Tracing the Coronal Line Region in AGN with VLT/NACO: The Very First Results
The coronal line region in AGN is an intermediate zone between the broad- and the narrow-line regions where lines with ionization potentials, IP >50 eV, are produced. Because these IP are not easily reachable in stars, coronal lines become unique tracers of the AGN activity. The coronal line region has so far remained unresolved as its typical size
Marco, Olivier et al.
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2005