A large fraction of otherwise normal galaxies shows weak nuclear activity. One of the signatures of the low-luminosity active galactic nuclei (LLAGNs) is the ultraviolet variability which was serendipitously discovered in the center of some low-ionization nuclear emission-line region (LINER) galaxies (see Ho 2008 for a review).
The ultraviolet flare at the center of the elliptical galaxy NGC 4278
CARDULLO, ANDREA;CORSINI, ENRICO MARIA;BEIFIORI, ALESSANDRA;DALLA BONTA', ELENA;PIZZELLA, ALESSANDRO;MORELLI, LORENZO;BERTOLA, FRANCESCO
2010
Abstract
A large fraction of otherwise normal galaxies shows weak nuclear activity. One of the signatures of the low-luminosity active galactic nuclei (LLAGNs) is the ultraviolet variability which was serendipitously discovered in the center of some low-ionization nuclear emission-line region (LINER) galaxies (see Ho 2008 for a review).
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