Central UV Spikes in two Galactic Spheroids
Abstract
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.
Cite
@article{arxiv.astro-ph/9901381,
title = {Central UV Spikes in two Galactic Spheroids},
author = {Michele Cappellari and Francesco Bertola and David Burstein and Lucio M. Buson and Laura Greggio and Alvio Renzini},
journal= {arXiv preprint arXiv:astro-ph/9901381},
year = {2007}
}
Comments
4 pages, 4 figures (LaTeX, cupconf.sty). To appear in the proceedings of the STScI workshop "When and How do Bulges Form and Evolve", eds. C. M. Carollo, H. C. Ferguson, and R. F. G. Wyse, Cambridge: CUP