Table 2
Linear regression coefficients for the Lick indices as function of radius.
| Inner galaxy (1) | Extended halo (2) | |||
| ILick(0) | ΔILick | ILick(0) | ΔILick | |
| Index | (Å) | (Å/dex) | (Å) | (Å/dex) |
|
|
||||
| Hβ | 1.1 ± 0.1 | −0.1 ± 0.2 | 1.5 ± 0.1 | 0.2 ± 0.5 |
| Fe5015 | 5.6 ± 0.3 | 1.9 ± 0.5 | 4.1 ± 0.4 | −2.8 ± 1.3 |
| Mg b | 4.7 ± 0.1 | −0.7 ± 0.2 | 4.4 ± 0.2 | −1.8 ± 0.8 |
| Fe5270 | 2.7 ± 0.2 | −0.7 ± 0.4 | 2.4 ± 0.2 | 1.5 ± 0.9 |
| Fe5335 | 2.7 ± 0.1 | −0.4 ± 0.2 | 2.7 ± 0.2 | −0.1 ± 0.9 |
| Fe5406 | 2.0 ± 0.2 | −0.4 ± 0.3 | 1.8 ± 0.2 | 0.5 ± 0.8 |
| Fe5709 | 0.7 ± 0.1 | −0.1 ± 0.1 | 0.6 ± 0.1 | 1.1 ± 0.6 |
Notes. (1) Linear regression coefficients for the Lick indices as function of radius in the inner galaxy (R ≤ Re), derived according to Eq. (2), where ILick(0) indicates the value of the indices at one effective radius and ΔILick indicates the gradients. (2) Same as (1) for the external halo (R>Re) region.
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