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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 H I tails: HCG 92, HCG 100 and six interacting systems

Texto completo
Autor(es):
de Mello, D. F. [1, 2] ; Urrutia-Viscarra, F. [3] ; Mendes de Oliveira, C. [3] ; Torres-Flores, S. [4] ; Carrasco, E. R. [5] ; Cypriano, E. [3]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Catholic Univ Amer, Dept Phys, Washington, DC 20064 - USA
[2] NASA, Goddard Space Flight Ctr, Observat Cosmol Lab, Greenbelt, MD 20771 - USA
[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Astron, BR-05508090 Sao Paulo - Brazil
[4] Univ La Serena, Dept Fis, La Serena - Chile
[5] So Operat Ctr, Gemini Observ AURA, La Serena - Chile
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 426, n. 3, p. 2441-2451, NOV 2012.
Citações Web of Science: 13
Resumo

We present new Gemini spectra of 14 new objects found within the H?i tails of Hickson Compact Groups (HCGs) 92 and 100. Nine of them are Galaxy Evolution Explorer (GALEX) far-ultraviolet (FUV) and near-ultraviolet (NUV) sources. The spectra confirm that these objects are members of the compact groups and have metallicities close to solar, with an average value of 12+log(O/H) similar to 8.5. They have average FUV luminosities 7 x 10(40)?erg?s-1 and very young ages (<100?Myr), and two of them resemble tidal dwarf galaxy (TDG) candidates. We suggest that they were created within gas clouds that were ejected during galaxygalaxy interactions into the intergalactic medium, which would explain the high metallicities of the objects, inherited from the parent galaxies from which the gas originated. We conduct a search for similar objects in six interacting systems with extended H?i tails: NGC 2623, NGC 3079, NGC 3359, NGC 3627, NGC 3718 and NGC 4656. We found 35 ultraviolet (UV) sources with ages < 100?Myr; however, most of them are on average less luminous/massive than the UV sources found around HCG 92 and HCG 100. We speculate that this might be an environmental effect and that compact groups of galaxies are more favourable to TDG formation than other interacting systems. (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: 07/06436-4 - Mapeamento de regiões de formação estelar intergalácticas, em sistemas de interação
Beneficiário:Paula Maria Fernanda Urrutia Viscarra
Linha de fomento: Bolsas no Brasil - Mestrado
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