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The aim of this work is to study the effects of environment on the growth insize of galaxies. We examine the stellar mass-size relation for a sample ofisolated galaxies interpreted as stellar systems where evolution has beenmainly governed by internal processes. Effects of environment on the stellarmass-size relation are evaluated by comparing our results with samples of lessisolated early- and late-type galaxies, as well as, for the first time,different spiral subtypes. We find no difference in the stellar mass-sizerelation for very isolated and less isolated early-type galaxies. We find thatlate-type isolated galaxies are ~1.2 times larger than less isolated objectswith similar mass. Isolated galaxies and comparison samples were divided into 6morphological ranges (E/S0, Spirals, Sb, Sbc, Sc, and Scd-Sdm) and 5 stellarmass bins between log(M*)=[9,11.5]. In all cases the relation is better definedand has less scatter for the isolated galaxies. We find that as themorphological type becomes later the galaxy size (for a fixed stellar mass)becomes larger. For the lowest stellar mass bins log(M*)=[9,10] we find goodagreement between sizes of AMIGA and comparison spirals. The isolated spiralgalaxies in the high stellar mass bins log(M*)=[10,11] tend to be larger thanless isolated galaxies. This difference in size is found for all spiralsubtypes and becomes larger when we compare fully isolated galaxies withgalaxies having 2 or more satellites (neighbors within 3 magnitudes ofdifference at a distance less than 250 kpc from the galaxy). Our resultssuggest that massive spiral galaxies located in low density environments, bothin terms of major companions and satellites, have larger sizes than samples ofless isolated galaxies. Hence the environment has played a role in the growthin size of massive spiral galaxies.

The stellar mass-size relation for the most isolated galaxies in the local Universe