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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.)

Star formation in the intragroup medium and other diagnostics of the evolutionary stages of compact groups of galaxies

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Autor(es):
Torres-Flores, S. [1, 2, 3] ; de Oliveira, C. Mendes [1] ; de Mello, D. F. [4, 5, 6] ; Amram, P. [2, 3] ; Plana, H. [2, 3, 7] ; Epinat, B. [8] ; Iglesias-Paramo, J. [9]
Número total de Autores: 7
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, Sao Paulo - Brazil
[2] Univ Aix Marseille 1, OAMP, Astrophys Lab, F-13388 Marseille 13 - France
[3] CNRS, F-13388 Marseille - France
[4] Johns Hopkins Univ, Baltimore, MD 21218 - USA
[5] Catholic Univ Amer, Washington, DC 20064 - USA
[6] NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 - USA
[7] Univ Estadual Santa Cruz, Lab Astrofis Teor & Observac, Santa Cruz - Brazil
[8] Univ Toulouse, CNRS, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse - France
[9] CSIC, Inst Astrofis Andalucia, E-18008 Granada - Spain
Número total de Afiliações: 9
Tipo de documento: Artigo Científico
Fonte: Astronomy & Astrophysics; v. 507, n. 2, p. 723-746, NOV 2009.
Citações Web of Science: 25
Resumo

Context. Compact groups of galaxies are entities that have high densities of galaxies and serve as laboratories to study galaxy interactions, intergalactic star formation and galaxy evolution. Aims. The main goal of this study is to search for young objects in the intragroup medium of seven compact groups of galaxies: HCG 2, 7, 22, 23, 92, 100 and NGC 92 as well as to evaluate the stage of interaction of each group. Methods. We used Fabry-Perot velocity fields and rotation curves together with GALEX NUV and FUV images and optical R-band and HI maps. Results. (i) HCG 7 and HCG 23 are in early stages of interaction; (ii) HCG 2 and HCG 22 are mildly interacting; and (iii) HCG 92, HCG 100 and NGC 92 are in late stages of evolution. We find that all three evolved groups contain populations of young blue objects in the intragroup medium, consistent with ages < 100 Myr, of which several are younger than < 10 Myr. We also report the discovery of a tidal dwarf galaxy candidate in the tail of NGC 92. These three groups, besides containing galaxies that have peculiar velocity fields, also show extended HI tails. Conclusions. Our results indicate that the advanced stage of evolution of a group, together with the presence of intragroup HI clouds, may lead to star formation in the intragroup medium. A table containing all intergalactic HII regions and tidal dwarf galaxies confirmed to date is appended. (AU)

Processo FAPESP: 07/07973-3 - A cinemática interna de galáxias em grupos compactos de Hickson
Beneficiário:Sergio Patricio Torres Flores
Linha de fomento: Bolsas no Brasil - Doutorado Direto
Processo FAPESP: 06/56213-9 - Nova física no espaço: formação e evolução de estruturas no universo
Beneficiário:Claudia Lucia Mendes de Oliveira
Linha de fomento: Auxílio à Pesquisa - Temático