Central UV Spikes in two Galactic Spheroids

Details Central UV Spikes in two Galactic Spheroids Central UV Spikes in two Galactic Spheroids

1999-01-27

arxiv.org/abs/astro-ph/9901381v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 figures (LaTeX, cupconf.sty). To appear in the proceedings of the STScI workshop "When and How do Bulges Form and E

Scientific paper

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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