Categories: galaxiesHubble

NGC 2275: An Absolute Unit of Galactic Flocculence

The Hubble Space Telescope has the knack for finding every size and shape of galaxy imaginable – from small, medium to large, all the way up to that funky size of absolute units.

This unusual galaxy, named NGC 2775, is incredibly fluffy-looking, or flocculent. It’s definitely a spiral, but instead of well-defined, organized spiral arms, it’s just a big fluff-ball of stars.

Hubble scientists say the flocculent nature of this galaxy indicate that star formation has been relatively quiet in the recent past. There is virtually no star formation in the central part of the galaxy, which is dominated by a large and relatively empty galactic bulge, where all the gas was converted into stars long ago.

The spiral pattern shown by the galaxy NGC 2275 in this image from the NASA/ESA Hubble Space Telescope is striking because of its delicate, feathery nature. Credit: ESA/Hubble & NASA, J. Lee and the PHANGS-HST Team; Acknowledgment: Judy Schmidt (Geckzilla)

It’s part of a small group of galaxies, which have apparently interacted with each other in the past. Here’s a Sloan Digital Sky Survey image of the NGC 2275 “group.”

The NGC 2275 Group of galaxies in the constellation Cancer. Credit: Sloan Digital Sky Survey.

And yes, flocculent is an actual category of spiral galaxies. (Here’s info on another recent find). NASA said that structure in the disks of flocculent spirals originate from regions of star formation that have been stretched into spiral patterns by the differential rotation of the galaxy.

NGC 2275 is located 67 million light-years away in the constellation of Cancer.

Visible are millions of bright, young, blue stars, and the spiral structure is interlaced with dark lanes of dust. Complexes of these hot, blue stars are thought to trigger star formation in nearby gas clouds.

This image was taken as part of the PHANGS project, Physics at High Angular resolution in Nearby GalaxieS. The project is building the first astronomical dataset charting the connections between young stars and cold molecular gas throughout a diversity of galactic environments.  

Find more info about this galaxy here.

Nancy Atkinson

Nancy has been with Universe Today since 2004. She is the author of a new book on the Apollo program, "Eight Years to the Moon," which shares the stories of 60 engineers and scientists who worked behind the scenes to make landing on the Moon possible. Her first book, "Incredible Stories from Space: A Behind-the-Scenes Look at the Missions Changing Our View of the Cosmos" tells the stories of those who work on NASA's robotic missions to explore the Solar System and beyond.

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