galassia di Seyfert

Vortici Maestosi da Hubble

This new Hubble image shows NGC 1566, a beautiful galaxy located approximately 40 million light-years away in the constellation of Dorado (The Dolphinfish). NGC 1566 is an intermediate spiral galaxy, meaning that while it does not have a well defined bar-shaped region of stars at its centre — like barred spirals — it is not quite an unbarred spiral either (heic9902o). The small but extremely bright nucleus of NGC 1566 is clearly visible in this image, a telltale sign of its membership of the Seyfert class of galaxies. The centres of such galaxies are very active and luminous, emitting strong bursts of radiation and potentially harbouring supermassive black holes that are many millions of times the mass of the Sun. NGC 1566 is not just any Seyfert galaxy; it is the second brightest Seyfert galaxy known. It is also the brightest and most dominant member of the Dorado Group, a loose concentration of galaxies that together comprise one of the richest galaxy groups of the southern hemisphere. This image highlights the beauty and awe-inspiring nature of this unique galaxy group, with NGC 1566 glittering and glowing, its bright nucleus framed by swirling and symmetrical lavender arms. This image was taken by Hubble’s Wide Field Camera 3 (WFC3) in the near-infrared part of the spectrum. A version of the image was entered into the Hubble’s Hidden Treasures image processing competition by Flickr user Det58.

Questa immagine mozzafiato ripresa dal telescopio Hubble mostra NGC 1566, una splendida galassia situata a circa 40 milioni di anni luce di distanza nella costellazione del Dorado. NGC 1566 è una galassia a spirale intermedia: anche se non ha una regione di stelle ben definita a forma di barra al suo centro, come le spirali barrate, non è nemmeno una spirale non barrata. Continua a leggere

Come un fiocco di neve


Ogni galassia a spirale è unica, come i fiocchi di neve: nessuna è uguale all’altra. Questo è dimostrato dalla sorprendente galassia a spirale visibile di faccia NGC 6814, il cui nucleo luminoso e gli spettacolari bracci avvolgenti, che si dispiegano con formazioni intricate di polvere oscura, vengono ripresi in questa splendida immagine del telescopio Hubble. Continua a leggere