
science & techESA/Hubble
A jellyfish-shaped galaxy's tendrils are gas stripped away by ram pressure
JO204 is a jellyfish galaxy about 600 million light-years away in the constellation Sextans. Its glowing blue tendrils look like drifting tentacles, but they are gas torn out of the galaxy as it moves through the hot intergalactic medium filling its galaxy cluster. This effect is called ram pressure stripping, similar to how wind tugs at loose hair and clothes while the body stays put. The colder, denser gas that gets stripped can collapse and form new stars in the tendrils. Hubble's image is the third in a series on jellyfish galaxies, drawn from a survey of six such galaxies.
Ram pressure stripping explains why galaxies in crowded clusters can stop forming stars at their centres while still forming them in strange new trails. It is a clear example of how environment shapes galaxy evolution.
ESA/Hubble · CC BY 4.0
Image: ESA/Hubble & NASA, M. Gullieuszik and the GASP team
