Quais são esses arcos estranhos? Enquanto imagem do aglomerado de galáxias Abell 370, os astrônomos notaram um arco incomum. O arco não foi entendido imediatamente – não até que melhores imagens mostrassem que o arco era um tipo de artefato astrofísico de uma lente gravitacional, antes invisível, onde a lente era o centro de todo um aglomerado de galáxias. Hoje, sabemos que esse arco, o arco mais brilhante do aglomerado, na verdade consiste em duas imagens distorcidas de uma galáxia razoavelmente normal que se encontra na distância. A gravidade de Abell 370 fez com que a luz das galáxias de fundo – e outras – se espalhasse e chegasse ao observador ao longo de múltiplos caminhos, ao contrário de uma luz distante que aparece através do caule de um copo de vinho. Quase todas as imagens amarelas apresentadas aqui são galáxias no cluster Abell 370. Um olho astuto pode captar muitos arcos estranhos e arclets distorcidos, no entanto, que são na verdade imagens gravitacionalmente de galáxias normais distantes. Estudar Abell 370 e suas imagens dão aos astrônomos uma janela única para a distribuição de matéria normal e escura em aglomerados de galáxias e no universo.
Crédito de imagem: NASA, ESA, Hubble;
Processamento e direitos autorais: Rogelio Bernal Andreo
Texto: Júlia Machado
NASA
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