Effect of the large scale environment on the stellar content of early-type galaxies

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dc.creatorPrugniel, Ph.
dc.creatorGolev, V.
dc.creatorMaubon, G.
dc.date1999-05-07
dc.date.accessioned2026-07-07T02:31:31Z
dc.date.available2026-07-07T02:31:31Z
dc.descriptionIn order to study the influence of the environment on the stellar population of early-type galaxies we have analyzed the relations between the density of the environment (lrho) and the residuals to the Mg2-sigma relation, R_a, and between lrho and the residuals to the Fundamental Plane, R_f. Our sample of galaxies covers the range of densities, between field galaxies and poor clusters. We confirm the existence of a slight environmental bias on the mean stellar population and we show that this effect is due to a small fraction of galaxie s containing a younger stellar sub-population while the majority of galaxies, in any environment, are equally old. The galaxies which are likely to contain a young stellar sub-population (negative R_a and R_f) are preferentially found in the less dense environment. This segregation of the stellar population may reflect the morphology-density relation or may result from a higher rate of recent star formation activity in sparse environments. Using the rotational support to assess the presence of a disk and to parameterize the morphology, we subtracted the contribution of the morphological segregation to population segregation. It is not yet possible to rule out that the morphology-density relation is at the origin of the population-density relation.
dc.description5 pages, 2 figures. Accepted for A&A (letters to the editors)
dc.identifierhttps://arxiv.org/abs/astro-ph/9905084
dc.identifierhttp://arxiv.org/abs/astro-ph/9905084
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14181
dc.subjectAstrophysics
dc.titleEffect of the large scale environment on the stellar content of early-type galaxies
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