A spectacular new view of two dwarf galaxies caught in the course of a cosmic collision reveals a glowing fuel bridge, streams of new child stars and the continuing gravitational tug-of-war reshaping each galaxies.
Taken by the James Webb House Telescope (JWST), the brand new picture captures the dwarf galaxies NGC 4490 and NGC 4485 stretching, tugging and warping each other in a dramatic gravitational dance unfolding 24 million light-years away. As a result of dwarf galaxies intently resemble the low-mass, gas-rich, metal-poor programs that populated the early universe, their collisions and fuel exchanges present a invaluable window into how the primary galaxies fashioned and advanced, in keeping with a statement from the European House Company.
“Aside from the Milky Way’s own dwarf companions — the Large and Small Magellanic Clouds — this is the closest known interacting dwarf-dwarf system where astronomers have directly observed both a gas bridge and resolved stellar populations,” ESA officials said in the statement.
While the galactic pair, collectively called Arp 269, has been previously studied using observations from the Hubble Space Telescope, Webb’s infrared vision has revealed the system in unprecedented detail. Using Webb’s Near-Infrared Camera (NIRCam) and Mid-Infrared Instrument (MIRI), scientists now have an up-close view of individual stars and the fine structure of the gas flowing between the galaxies.
![This Webb image shows two interacting galaxies. NGC 4490 occupies the left side of the image, while NGC 4485 appears as a white glowing hue in the top right of the field. Both galaxies are connected by a bright stream of red stretching from the top left of the image, through the bottom centre, and ending at the right under galaxy NGC 4485. There are regions of bright blue ionised gas visible in concentrated areas of the red stream. The background is black with multiple galaxies in various shapes throughout.]](https://cdn.mos.cms.futurecdn.net/iGsxpNf8JjDaMUWTYeALxa-1200-80.jpg.webp)
“By dissecting these galaxies star by star, researchers were able to map out where young, middle-aged, and old stars reside, and trace the timeline of the galaxies’ interaction,” ESA officials said.
“By capturing the history of the galactic dancers NGC 4490 and NGC 4485, Webb has revealed new details in how dwarf galaxies interact, giving us a glimpse of how small galaxies near and far grow and evolve,” ESA officials said in the statement.
