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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Dissecting galaxy triplets in the Sloan Digital Sky Survey Data Release 10-I. Stellar populations and emission line analysis

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Autor(es):
Costa-Duarte, M. V. ; O'Mill, A. L. ; Duplancic, F. ; Sodre, Jr., L. ; Lambas, D. G.
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 459, n. 3, p. 2539-2549, JUL 1 2016.
Citações Web of Science: 1
Resumo

We identify isolated galaxy triplets in a volume-limited sample from the Sloan Digital Sky Survey Data Release 10. Our final sample has 80 galaxy systems in the redshift range 0.04 less than or similar to z <= 0.1, brighter than M-r =-20.5 + 5 log h(70). Spectral synthesis results and WHAN and BPT diagnostic diagrams were employed to classify the galaxies in these systems as star-forming, active nuclei, or passive/retired. Our results suggest that the brightest galaxies drive the triplet evolution, as evidenced by the strong correlations between properties as mass assembly and mean stellar population age with triplet properties. Galaxies with intermediate luminosity or the faintest one within the triplet seem to play a secondary role. Moreover, the relation between age and stellar mass of galaxies is similar for these galaxies but different for the brightest galaxy in the system. Most of the triplet galaxies are passive or retired, according to the WHAN classification. Low-mass triplets present different fractions of WHAN classes when compared to higher mass triplets. A census of WHAN class combinations shows the dominance of star-forming galaxies in low-mass triplets while retired and passive galaxies prevail in high-mass systems. We argue that these results suggest that the local environment, through galaxy interactions driven by the brightest galaxy, is playing a major role in triplet evolution. (AU)

Processo FAPESP: 09/54006-4 - Um cluster de computadores para o Departamento de Astronomia do IAG-USP e para o Núcleo de Astrofísica da UNICSUL
Beneficiário:Elisabete Maria de Gouveia Dal Pino
Linha de fomento: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
Processo FAPESP: 14/18632-6 - A teia cósmica descrita pelos superaglomerados de galáxias
Beneficiário:Marcus Vinícius Costa Duarte
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 12/00800-4 - O universo em 3-D: astrofísica com grandes levantamentos de galáxias
Beneficiário:Laerte Sodré Junior
Linha de fomento: Auxílio à Pesquisa - Temático