Large-scale flows in the Milky Way halo

This diagram shows the large-scale flows of gas in the Milky Way halo of faint stars and hot gas. Using the Hubble Space Telescope's Cosmic Origins Spectrograph and Space Telescope Imaging Spectrograph, Nicolas Lehner and Chris Howk at the University of Notre Dame were able to directly constrain the distance of the fast-moving ionized clouds responsible for flows of gas in the Milky Way halo. The invisible clouds were detected by finding their absorption signature in the ultraviolet spectra of distant background halo stars. The researchers found that the clouds are reservoirs of gas that enable stars to continue to form in the Milky Way. Without the replenishment from recycled gas and infalling extragalactic material, stars would have stopped forming in the Milky Way a long time ago. This study also suggests the clouds slow down as they approach the Milky Way.

Credit:

Illustration Credit: NASA, ESA, and A. Feild (STScI). Science Credit: NASA, ESA, and N. Lehner and C. Howk (University of Notre Dame)

About the Image

NASA press release
NASA caption
Id:opo1126a
Type:Artwork
Release date:30 August 2011, 13:38
Size:3300 x 2400 px

About the Object

Type:• X - Illustration Images


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