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© ESA
18 September 2023
Intergalactic bridge connects a galactic smash-up
A faint ‘bridge’ of gas connects two colliding galaxies in a new photo from the Hubble Space Telescope. The Arp 107 system includes a pair of galaxies that are in the process of merging. Located about 465 million light years from Earth, the galactic duo is connected by a tenuous stream of dust and gas. Hubble, a joint mission led by NASA and the European Space Agency (ESA), snapped this new view of Arp 107 using its Advanced Camera for Surveys. The larger galaxy, captured on the left of the image, boasts one large spiral arm that curves around the galactic core. Known as a Seyfert galaxy, this cosmic realm is home to an active galactic nucleus. “Seyfert galaxies are notable because despite the immense brightness of the active core, radiation from the entire galaxy can be observed,” ESA officials said. “This is evident in this image, where the spiralling whorls of the whole galaxy are readily visible.”
Active galactic nuclei exhibit an intense glow associated with material falling into the supermassive black hole at the centre of the galaxy. In fact, the radiation emitted by an active galactic nucleus can outshine the combined light of every single star in its host galaxy. The galaxy’s bright spiral arm is speckled with budding stars – stellar births fuelled by the abundant source of material being siphoned from the smaller companion galaxy, which can be seen to the lower right of the image.