Table 1
Value of the blue tilt slope γ = d(U − I) / dI and of the mass-metallicity relation exponent α obtained for Centaurus and Hydra with our data for the range I< 24.0 mag, compared to results of previous studies on these clusters and other environments.
| Sample | γ blue | α blue ( Z ∝ Mα) | γ red | α red ( Z ∝ Mα) |
|
|
||||
| Centaurus | − 0.057 ± 0.011 [±0.003] | 0.27 ± 0.05 | −0.086 ± 0.015 [±0.002] | 0.22 ± 0.04 |
| Hydra | − 0.081 ± 0.012 [±0.005] | 0.40 ± 0.06 | −0.002 ± 0.034 [±0.004] | 0.01 ± 0.09 |
| Hydra (Wehner et al. 2008) | 0.60 ± 0.20 | |||
| BCGs (Harris et al. 2009a) | 0.48 ± 0.12 | −0.11 ± 0.06 | ||
| M104 (Harris et al. 2010) | 0.29 ± 0.04 | |||
| FCS (Mieske et al. 2010) | 0.38 ± 0.08 | 0.03 ± 0.05 | ||
| VCS (Mieske et al. 2010) | 0.62 ± 0.08 | 0.12 ± 0.05 | ||
Notes. In brackets we also indicate the errors arising from the randomised background subtraction in magnitude–colour cells.
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