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The dark matter halo of NGC 1399 - CDM or MOND?
T. Richtler, Y. Schuberth, M. Hilker +3
Central galaxies in galaxy clusters may be key discriminants in the competition between the cold dark matter (CDM) paradigm and modified Newtonian dynamics (MOND). We investigate t…
Stroemgren metallicity calibration: the m1, b-y relation
A. Calamida, G. Bono, P. B. Stetson +15
We performed a new calibration of the Stroemgren metallicity index m1 based on the b-y color of cluster red giant stars. The current Metallicity-Index-Color relation is not linear…
A flat faint end of the Fornax cluster galaxy luminosity function
Steffen Mieske, Michael Hilker, Leopoldo Infante +1
We analyse the photometric properties of the early-type Fornax cluster dwarf galaxy population (M_V>-17 mag), based on a wide field imaging study of the central cluster area in V a…
Stroemgren photometry of Galactic Globular Clusters. I. New Calibrations of the metallicity index
A. Calamida, G. Bono, P. B. Stetson +15
We present a new calibration of the Stroemgren metallicity index m1 using red giant (RG) stars in 4 globular clusters (GCs:M92,M13,NGC1851,47Tuc) with metallicity ranging from [Fe/…
A search for ultra-compact dwarf galaxies in the Centaurus galaxy cluster
S. Mieske, M. Hilker, A. Jordan +2
Aim: To extend the investigations of ultra-compact dwarf galaxies (UCDs) beyond the well studied Fornax and Virgo clusters. Methods: We measured spectroscopic redshifts of about 40…
Metallicity distribution of Omega Cen Red Giants based on the Stroemgren m1 metallicity index
A. Calamida, G. Bono, L. M. Freyhammer +6
We adopted uvby Stroemgren photometry to investigate the metallicity distribution of Omega Cen Red Giant (RG) stars. We provided a new empirical calibration of the Stroemgren m1 =…