Reference Tables in the Line Index System
One of the reasons many authors keep using the Lick/IDS system is to compare with previous studies, which are usually presented in this system. We provide here with a set of indices, obtained from several references already transformed to the new systems. We have selected several samples of early-type galaxies and globular clusters from the literature and transformed the line-strength indices to the new systems defined here. This is intended to provide a benchmark of indices properly transformed into LIS and measured on high quality data that other authors can use to compare with.
The selected samples are the following (see below or in Vazdekis et al. 2010 for details of the samples):
| Sample | LIS-5.0Å | LIS-8.4Å | LIS-14.0Å |
|---|---|---|---|
| Puzia et al. (2002) | link | --- | --- |
| Schiavon et al. (2005) | link | --- | --- |
| Trager et al. (2000) | --- | link | link |
| Sánchez-Blázquez et al. (2006) | --- | link | link |
| Yamada et al. (2006) | --- | link | link |
| Kuntschner et al. (2006) | --- | link | link |
This sample comprises 12 Galactic globular clusters. Lick indices were measured from long-slit spectra obtained with the Boller & Chivens Spectrograph mounted on the 1.5m telescope in La Silla. The wavelength coverage of the spectra ranges from 3400 to 7300 Å with a final resolution of ~6.7Å. All the spectra were observed with a slit with of 3.0".
The sample consists of 40 galactic globular clusters, obtained with the Blanco 4-m telescope at the Cerro Tololo observatory. The spectra cover the range ~3350-6430 Å with 3.1Å (FHWM) resolution. The signal-to-noise ratio of the flux calibrated spectra ranges from 50 to 240Å-1 at 4000Å and from 125 to 500Å-1 at 5000Å. The sample has been carefully selected to contain globular clusters with a range of ages and metallicities.
This sample consist of 40 galaxies drawn from that of González (1993) intended to cover, relatively uniformly, the full range of velocity dispersion, line-strength and color displayed by local elliptical galaxies. The line-strength indices (i.e. Hβ, Mgb, Fe5270, Fe5335) were measured from long-slit data obtained with the CCD Cassegrain Spectrograph on the 3m Shane Telescope of Lick Observatory. The spectral features were measured within Re/8 aperture.
This sample consists of 98 early-type galaxies including ellipticals and lenticulars, spanning a wide range in central velocity dispersion (σ). The sample contains galaxies in different environments: isolated galaxies, galaxies in groups, and in several clusters. The central spectra were extracted within an aperture 0.6~kpc (assuming H0=70 kms-1). The spectral range covers from ~3500/3700 (depending on the run) to ~5200/5700Å with spectral resolution ranging from 3.6 to 6.56Å (FWHM) (see original paper for more details).
The sample consists of 14 galaxies, morphologically classified as E in the Virgo cluster. The galaxies where selected with three criteria: (1) they had to be classified as elliptical galaxy in the RC3 catalogue (de Vaucouleurs et al. 1991); (2) they had to be free from strong emission lines; (3) they have to cover a wide range of luminosity evenly distributed along the color-magnitude of the Virgo cluster. These extremely high quality spectra, which have been extracted within an aperture of Re/10, have signal-to-noise ratio well above >100Å-1 for all the galaxies, and about ~500Å-1 for some of them. The spectra cover a wavelength range from 3800 to 5800Å, and the resolution ranges from 2.0Å to 3.1Å depending on the observational runs, which have been performed at the William Herschel (4.2m) and Subaru (8.2m) telescopes.
This sample consists of 48 E/S0 galaxies in the SAURON survey of early-type galaxies (de Zeeuw et al. 2002) at the William Herschel 4.2m telescope in La Palma. We use here the line strength measurements (i.e. Hβ, Fe5015, Mgb) averaged within r$_e$/8 aperture. The spectral coverage of the observed SAURON integral-field observations ranges from 4800 to 5380Å at resolution ~4.2Å (FWHM).