Line-strength indices and velocity dispersions for 148 early-type galaxies in different environments
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We have derived high quality line-strength indices and velocity dispersions for a sample of 148 early-type galaxies
in different environments. The wavelength region covered by the observations ( λ≃4600 to 6600 Å) includes the Lick/IDS
indices Hβ, Mg1, Mg2, Mgb, Fe5015, Fe5270, Fe5335, Fe5406, Fe5709, Fe5782, NaD, TiO1 and TiO2. The data are intended
to address possible differences of the stellar populations of early-type galaxies in low- and high-density environments. This
paper describes the sample properties, explains the data reduction and presents the complete list of all the measurements. Most
galaxies of the sample (85%) had no previous measurements of any Lick/IDS indices and for 30% of the galaxies we present
first-time determinations of their velocity dispersions. Special care is taken to identify galaxies with emission lines. We found
that 62 per cent of the galaxies in the sample have emission lines, as measured by the equivalent width of the [OIII] 5007Å line,
EW[OIII] > 0.3 Å.
Original language | English |
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Pages (from-to) | 431-442 |
Journal | Astronomy and Astrophysics |
Volume | 395 |
Issue number | 2 |
DOIs | |
Publication status | Published - 4 Nov 2002 |
Documents
- aa1746
Rights statement: copyright ESO 2002
Final published version, 671 KB, PDF document
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