#Astronomy; #GallacticWinds; #Makani
California, Oct 31 (Canadian-Media): A new discovery was made by a group of collaborators from around the world including University of California (CN), San Diego's Alison Coil, and Rhodes College's David Rupke by exploring the influence of galactic winds from a distant galaxy called Makani, phys.org reports said.
A volume rendering of the ionized gas wind in Makani. Two of the dimensions are spatial, and the third is velocity. The colors trace the velocity axis, shown by the arrow at center. The approximate locations of the two proposed outflow episodes are labeled. Credit: Jim Geach, David Tree, Peter Richardson (University of Hertfordshire)
Their study's findings were published in Nature and provided, for the first time direct evidence of the role of galactic winds—ejections of gas from galaxies—in creating the circumgalactic medium (CGM). The unique composition of Makani—meaning wind in Hawaiian—uniquely lent itself to the breakthrough findings.
The study indicated that the hourglass shape of Makani's nebula is strongly reminiscent of similar galactic winds in other galaxies, but that Makani's wind is much larger than in other observed galaxies.
"This means that we can confirm it's actually moving gas from the galaxy into the circumgalactic regions around it, as well as sweeping up more gas from its surroundings as it moves out," Rupke explained. "And it's moving a lot of it—at least one to 10 percent of the visible mass of the entire galaxy—at very high speeds, thousands of kilometers per second..."Makani's existence provides one of the first direct windows into how a galaxy contributes to the ongoing formation and chemical enrichment of its CGM."