MUSE observations of a changing-look AGN – I. The reappearance of the broad emission lines
- Raimundo, S I
- Vestergaard, M
- Koay, J Y
- Lawther, D
- Casasola, V
- Peterson, B M
DOIAbstract
Optical changing-look Active Galactic Nuclei (AGN) are a class of sources that change type within a short time-scale of years or decades. This change is characterized by the appearance or disappearance of broad emission lines, often associated with dramatic AGN continuum flux changes that are orders of magnitude larger than those expected from typical AGN variability. In this work we study for the first time the host galaxy of a changing-look AGN, Mrk 590, using high spatial resolution optical and near-infrared observations. We discover that after similar to 10 yr absence, the optical broad emission lines of Mrk 590 have reappeared. The AGN optical continuum flux however is still similar to 10 times lower than that observed during the most ...
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