Surface Brightness Fluctuations From Archival ACS Images: A Stellar Population And Distance Study

Details Surface Brightness Fluctuations From Archival ACS Images: A Stellar Population And Distance Study Surface Brightness Fluctuations From Archival ACS Images: A Stellar Population And Distance Study

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.8107c&link_type=abstract

American Astronomical Society Meeting 210, #81.07; Bulletin of the American Astronomical Society, Vol. 39, p.326

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Scientific paper

We have derived Surface Brightness Fluctuations (SBF) and integrated magnitudes in the V- and I-bands using Advanced Camera for Surveys (ACS) archival images. The sample includes 14 galaxies covering a wide range of physical properties: morphology, integrated color, etc. We take advantage of the latter characteristic of the sample to check existing empirical calibrations of absolute SBF magnitudes. Additionally, by comparing our SBF and color data with the Teramo-SPoT SSP models, and other recent sets of population synthesis models, we discuss the feasibility of stellar populations studies based on fluctuation magnitudes analysis. The main result of this study is that multi-band optical SBF data and integrated colors can be used to significantly constrain the chemical composition of the dominant stellar system in the galaxy, but not the age in the case of systems older than 3 Gyr.
Thanks to the exceptional capabilities of the ACS camera, SBF color gradients are also detected and analyzed. These SBF gradient data, together with other available data, point to the existence of mass dependent metallicity gradients in galaxies, with the more massive objects being more metal rich in the inner regions with respect to the outer ones.

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