%0 Journal Article
%4 sid.inpe.br/mtc-m21c/2020/05.04.11.29
%2 sid.inpe.br/mtc-m21c/2020/05.04.11.29.03
%@doi 10.1093/mnras/staa386
%@issn 0035-8711
%@issn 1365-2966
%T Stellar population properties of ETGs in compact groups of galaxies
%D 2020
%8 Apr.
%9 journal article
%A Moura, Tatiana C.,
%A Carvalho, Reinaldo Ramos de,
%A Rembold, Sandro B.,
%A Trevisan, Marina,
%A Ribeiro, André L. B.,
%A Pérez-Villegas, Angeles,
%A La Barbera, Francesco,
%A Stalder, Diego H.,
%A Rosa, Reinaldo Roberto,
%@affiliation Universidade de São Paulo (USP)
%@affiliation Universidade Cidade de São Paulo
%@affiliation Universidade Federal de Santa Maria (UFSM)
%@affiliation Universidade Federal do Rio Grande do Sul (UFRGS)
%@affiliation Universidade Estadual de Santa Crzuy
%@affiliation Universidade de São Paulo (USP)
%@affiliation Observatorio Astronomico di Capodimonte
%@affiliation Universidad Nacional de Asunción
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress reinaldo.rosa@inpe.br
%B Monthly Notices of the Royal Astronomical Society
%V 493
%N 3
%P 3238-3254
%K galaxies: active, galaxies: evolution, galaxies: groups: general, galaxies: interactions, galaxies: stellar content.
%X We present results on the study of the stellar population in early-type galaxies (ETGs) belonging to 151 compact groups (CGs). We also selected a field sample composed of 846 ETGs to investigate environmental effects on galaxy evolution. We find that the dependences of mean stellar ages, [Z/H] and [alpha/Fe] on central stellar velocity dispersion are similar, regardless where the ETG resides, CGs or field. When compared to the sample of centrals and satellites from the literature, we find that ETGs in CGs behave similarly to centrals, especially those embedded in low-mass haloes (M-h < 10(12.5) M-circle dot). Except for the low-mass limit, where field galaxies present a star-forming signature, not seen in CGs, the ionization agent of the gas in CG and field galaxies seem to be similar due to hot, evolved low-mass stars. However, field ETGs present an excess of H alpha emission relative to ETGs in CGs. Additionally, we performed a dynamical analysis, which shows that CGs present a bimodality in the group velocity dispersion distribution - a high- and low-sigma mode. Our results indicate that high-sigma groups have a smaller fraction of spirals, shorter crossing times, and a more luminous population of galaxies than the low-sigma groups. It is important to emphasize that our findings point to a small environmental impact on galaxies located in CGs. The only evidence we find is the change in gas content, suggesting environmentally driven gas loss.
%@language en
%3 moura-stellar.pdf