The galaxy appears to be surrounded by a halo of gas, dust, and stars.
The complete image of the galaxy and the polar ring detected by ASKAP.Image Credit: Jayanne English , Nathan Deg & WALLABY Survey, CSIRO/ASKAP, NAOJ/Subaru Telescope Science Credit: N. Deg and K. Spekkens and WALLABY survey “The findings suggest that one to three per cent of nearby galaxies may have gaseous polar rings, which is much higher than suggested by optical telescopes,” said Nathan Deg, an astronomer at Queen’s University in Canada and the study’s lead author, in a CSIRO release.
ways. One theory is that the rings form from material accreted to the galaxy by another galaxy passing nearby. The material is then shredded up, giving the blend of gas, dust, and stellar material its opaque, amorphous look. Another theory is that hydrogen gas travels alongWALLABY survey aims to image the entirety of the southern sky and visualize the gas distribution across hundreds of thousands of galaxies. So far the team has detected two apparent polar ring galaxies—NGC 4632 and NGC 6156—out of 600 galaxies observed so far.
“Using ASKAP over coming years we expect to reveal more than 200,000 hydrogen-rich galaxies, among them many more unusual galaxies like these ones with polar rings,” said Bärbel Koribalski, an astronomer at CSIRO and co-author of the new research, in the same release.Though the data suggested that two of the galaxies seen by WALLABY have polar rings, they “do not definitively prove” that fact, the researchers wrote.
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