M95: Galáxia espiral com anel interno

Por que algumas galáxias espirais têm um anel ao redor do centro? Em primeiro lugar, o M95 é um dos exemplos mais próximos de uma grande e bela galáxia espiral barrada. Visíveis na combinação de imagens do Hubble e em vários telescópios terrestres, estão espalhados braços espirais delineados por aglomerados abertos de estrelas azuis brilhantes, faixas de poeira escura, o brilho difuso de bilhões de estrelas fracas e uma barra curta no centro da galáxia. O que intriga muitos astrônomos, no entanto, é o anel circunuclear em torno do centro da galáxia visível logo fora da barra central. Embora a estabilidade a longo prazo deste anel permaneça um tópico de pesquisa, as observações indicam que seu brilho atual é pelo menos aprimorado por explosões transitórias da formação de estrelas. O M95, também conhecido como NGC 3351, abrange cerca de 50.000 anos-luz, fica a cerca de 30 milhões de anos-luz de distância e pode ser visto com um pequeno telescópio em direção à constelação do Leão (Leo).

Crédito de imagem: NASA, ESA, Hubble, ESO, Amateur Data.
Processamento e direitos autorais: Robert Gendler & Roberto Colombari.

Telescópio Espacial Hubble

Texto: Júlia Machado

(NASA)

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