Surface Brightness Fluctuations with 8-m class telescope
S. Mei, D. Silva, P. Quinn
European Southern Observatory, Karl-Schwarzschild-Strasse 2,
D-85748 Garching, Germany
We have studied I and K-band Surface Brightness Fluctuations as distance indicators when applied on 8-m class telescopes, such as the Very Large Telescope (VLT).
With 8-m class telescopes one can extend I--band SBF measurements out to $\approx$ 7000 km/s. In the K-band, exposure times are very expensive from the ground, due to the high infrared background. K--band measurements from the ground are nevertheless necessary to understand the role of stellar population effects on SBF calibration, as a basis for future measurements in space.
In the context of K--band SBF calibration, we re-measured K-band SBF in NGC 4489 and we confirm the detection of an anomalous stellar population in this galaxy.