Table 2.
Coefficients of the linear fits to the logarithmic radial variation in spectral indices.
| Index | I0.1 | ∇I |
|---|---|---|
| MgI2.10 | 1.06 ± 0.12 (0.73 ± 0.04) | −0.22 ± 0.13 (0.00 ± 0.03) |
| NaI2.21 | 1.77 ± 0.14 (1.35 ± 0.04) | −0.45 ± 0.15 (−0.40 ± 0.03) |
| FeI2.23 | 1.19 ± 0.14 (0.99 ± 0.04) | 0.10 ± 0.14 (−0.17 ± 0.03) |
| FeI2.24 | 1.15 ± 0.25 (1.03 ± 0.06) | −0.33 ± 0.26 (−0.10 ± 0.06) |
| CaI2.26 | 2.29 ± 0.23 (2.20 ± 0.05) | −0.05 ± 0.24 (−0.31 ± 0.05) |
| MgI2.28 | 0.98 ± 0.24 (0.70 ± 0.04) | −0.13 ± 0.24 (−0.04 ± 0.04) |
| CO2.30 | 13.18 ± 0.29 (11.10 ± 0.06) | 0.11 ± 0.29 (−0.39 ± 0.06) |
| CO2.32 | 9.22 ± 0.41 (8.36 ± 0.07) | −0.90 ± 0.42 (−0.44 ± 0.06) |
Notes. Radial variations are computed with respect to galactocentric distance, R/Re, for M87 and for the bulge of M31 (in parentheses). For each index (Column 1), the offset, I0.1, of the relation (at R = 0.1 Re), and its slope, ∇I, are provided in Columns 2 and 3, respectively. Uncertainties are quoted at the 1-sigma level.
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