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"And I beheld, and heard the voice of one eagle flying through the midst of heaven,
saying with a loud voice: Woe, woe, woe to the inhabitants of the earth....
[Apocalypse (Revelation) 8:13]

Monday, January 23, 2017

Signs in the Skies: Something Silent But Deadly Is Killing Galaxies

Signs in the Skies: Something Silent But Deadly Is Killing Galaxies

Across the universe, unsuspecting galaxies are literally getting the life sucked out of them. Though the culprit is still at large, a team of researchers at the International Centre for Radio Astronomy Research (ICRAR) in Western Australia is working tirelessly to crack the case—and to restore law and order.



After examining 11,000 galaxies using the Sloan Digital Sky Survey and Arecibo Legacy Fast ALFA survey, the team concluded that a process called ram-pressure stripping—which forces gas out of galaxies—is more common than previously imagined. It’s a quick death, because without gas, galaxies are unable to produce more stars. The group’s findings were published on January 17th in the Monthly Notices of the Royal Astronomical Society.
So, who’s the prime suspect in this crime? It’s none other than dark matter: the mysterious, invisible material thought to make up 27 percent of the universe. Turns out, it’s also quite the smooth criminal.
“During their lifetimes, galaxies can inhabit [dark matter] halos of different sizes, ranging from masses typical of our own Milky Way to halos thousands of times more massive,” Toby Brown, the lead author of the study and a PhD candidate at ICRAR, said in a press release.
“As galaxies fall through these larger halos, the superheated intergalactic plasma between them removes their gas in a fast-acting process called ram-pressure stripping.”

The team’s research suggests that not only is ram-pressure stripping pretty common, it can happen to small and large galactic groups alike.
“This paper demonstrates that the same process is operating in much smaller groups of just a few galaxies together with much less dark matter,” Brown said. “Most galaxies in the universe live in these groups of between two and a hundred galaxies.”
It’s a tragic tale, but it could be worse: some galaxies get strangled to death. It’s a cold universe out there, but no one said the final frontier was for the faint of heart.

For video:
http://gizmodo.com/something-silent-but-deadly-is-killing-galaxies-1791328049