Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342407k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #424.07; Bulletin of the American Astronomical Society, Vol. 41, p.247
Astronomy and Astrophysics
Astronomy
Scientific paper
The remarkable variation of UV-optical ratios in elliptical galaxies suggests that the observed "UV-excess" may be uniquely sensitive to their star formation histories and chemical enrichment. While the stellar evolutionary phase responsible for creating this "excess" is fairly well understood (He-rich, hot-HB stars), the UV emission of an integrated stellar population and its dependence on global characteristics such as metallicity is far more complex. Because they are mostly simple stellar populations with small dispersion in age and abundance, globular clusters (GCs) have been considered good calibrators for understanding these global characteristics. The GCs of M87 appear to follow a far-UV-metallicity relation (FUV - Mg_2) similar to Milky Way GCs, but distinct from that observed for ellipticals.Ultra-compact dwarf galaxies (UCDs) may provide an alternative, more luminous calibrator of the UV-excess in early-type galaxies. Near- and far-UV GALEX imaging provides tantalising hints that at least some UCDs exhibit a "UV-excess" comparable to the UV-luminous GCs in M87. I will present the FUV - Mg_2 relation for Fornax Cluster UCDs from GALEX imaging and our Magellan/IMACS spectroscopy, and compare them with NGC1399 GCs and cluster dE,Ns. By combining GALEX imaging with our optical g,r,i imaging, I will also show that the UV-optical properties of Fornax UCDs and NGC1399 GCs, provide an efficient tool for discriminating between new candidates and foreground stars in ground based images.
Gregg Mark
Karick Arna
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