Central UV Spikes in two Galactic Spheroids
Cappellari, Michele · Bertola, Francesco · Burstein, David · Buson, Lucio M. · Greggio, Laura · Renzini, Alvio
Original · EN
FOS spectra and FOC photometry of two centrally located, UV-bright spikes in the elliptical galaxy NGC 4552 and the bulge-dominated early spiral NGC 2681, are presented. These spectra reveal that such point-like UV sources detected by means of HST within a relatively large fraction 15% of bulges can be related to radically different phenomena. While the UV unresolved emission in NGC 4552 represents a transient event likely induced by an accretion event onto a supermassive black hole, the spike seen at the center of NGC 2681 is not variable and it is stellar in nature.
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