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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Stellar population properties of ETGs in compact groups of galaxies

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Author(s):
Moura, Tatiana C. [1] ; de Carvalho, Reinaldo R. [2] ; Rembold, Sandro B. [3] ; Trevisan, Marina [4] ; Ribeiro, Andre L. B. [5] ; Perez-Villegas, Angeles [1] ; La Barbera, Francesco [6] ; Stalder, Diego H. [7] ; Rosa, Reinaldo R. [8]
Total Authors: 9
Affiliation:
[1] Univ Sao Paulo, IAG, Rua Matao 1226, BR-05508900 Sao Paulo - Brazil
[2] Univ Cidade S ao Paulo, Univ Cruzeiro Sul, NAT, BR-01506000 Sao Paulo - Brazil
[3] Univ Fed Santa Maria, BR-97105900 Santa Maria, RS - Brazil
[4] Univ Fed Rio Grande do Sul, Dept Astron, CP 15051, BR-91501970 Porto Alegre, RS - Brazil
[5] Univ Estadual Santa Cruz, Rodovia Jorge Amado Km 16, BR-45662000 Ilheus, BA - Brazil
[6] INAF, Observ Astron Capodimonte, I-80131 Naples - Italy
[7] Univ Nacl Asuncion, Fac Ingn, San Lorenzo 111421 - Paraguay
[8] Inst Nacl Pesquisas Espaciais, MCTIC, LABAC, Av Astronautas 1758, SJ Campos, BR-12227010 Sao Paulo - Brazil
Total Affiliations: 8
Document type: Journal article
Source: Monthly Notices of the Royal Astronomical Society; v. 493, n. 3, p. 3238-3254, APR 2020.
Web of Science Citations: 0
Abstract

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. (AU)

FAPESP's process: 18/03480-7 - Modeling integrated spectra of globular clusters and galaxies
Grantee:Tatiana Coelho de Moura Bastos
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 17/15893-1 - Globular cluster orbits of bulge: the formation and evolution of the Milky Way
Grantee:Maria de Los Angeles Perez Villegas
Support type: Scholarships in Brazil - Post-Doctorate