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Date and Time of the Query: 2019-03-21 T09:46:47 PDT
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For refcode 2005MNRAS.356.1440D:
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Copyright by Royal Astronomical Society. 2005MNRAS.356.1440D Group, field and isolated early-type galaxies - I. Observations and nuclear data Denicolo, G.; Terlevich, Roberto; Terlevich, Elena; Forbes, Duncan A.; Terlevich, Alejandro; Carrasco, Luis Abstract. This is the first paper of a series on the investigation of stellar population properties and galaxy evolution of an observationally homogeneous sample of early-type galaxies in groups, field and isolated galaxies. Here we present high signal-to-noise ratio (S/N) long-slit spectroscopy of 86 nearby elliptical and S0 galaxies. Eight of them are isolated, selected according to a rigorous criterion, which guarantees a genuine low-density subsample. The present survey has the advantage of covering a larger wavelength range than normally found in the literature, which includes [OIII]lambda5007 and H{alpha}, both lines important for emission correction. Among the 86 galaxies with S/N >= 15 (per resolution element, for r_e_/8 central aperture), 57 have their H{beta}-index corrected for emission (the average correction is 0.190 {angstrom} H{beta}) and 42 galaxies reveal [OIII]lambda5007 emission, of which 16 also show obvious H{alpha} emission. Most of the galaxies in the sample do not show obvious signs of disturbances nor tidal features in the morphologies, although 11 belong to the Arp catalogue of peculiar galaxies; only three of them (NGC 750, 751 and 3226) seem to be strongly interacting. We present the measurement of 25 central line-strength indices calibrated to the Lick/IDS system. Kinematic information is obtained for the sample. We analyse the line-strength index versus velocity dispersion relations for our sample of mainly low-density environment galaxies, and compare the slope of the relations with cluster galaxies from the literature. Our main findings are that the index-{sigma}_0_ relations presented for low-density regions are not significantly different from those of cluster E/S0s. The slope of the index-{sigma}_0_ relations does not seem to change for early-type galaxies of different environmental densities, but the scatter of the relations seems larger for group, field and isolated galaxies than for cluster galaxies.
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