Line-strength indices and velocity dispersions for 148 early-type galaxies in different environments

Details Line-strength indices and velocity dispersions for 148 early-type galaxies in different environments Line-strength indices and velocity dispersions for 148 early-type galaxies in different environments

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...395..431b&link_type=abstract

Astronomy and Astrophysics, v.395, p.431-442 (2002)

Astronomy and Astrophysics

Astrophysics

32

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Abundances, Galaxies: Stellar Content

Scientific paper

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 (lambda =~ 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. Tables 5 and 6 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/ cgi-bin/qcat?J/ A+A/395/431. They are also available via ftp at ftp.mpe.mpg.de in the directory people/dthomas/Beuing02 or via WWW at ftp://ftp.mpe.mpg.de/people/dthomas/Beuing02.

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