Astronomers discover the Ed Begley Jr. of galaxies
An international team of researchers have spotted the most fuel-efficient galaxy yet, which converts nearly 100 percent of its hydrogen gas into stars.
An international team of researchers have spotted the most fuel-efficient galaxy yet, which converts nearly 100 percent of its hydrogen gas into stars.
Six billion or so light years from here, there's a galaxy that seems to take seriously the old Lakota maxim about using the whole buffalo.
Except by "use" we mean "form stars out of" and by "buffalo" we mean "interstellar hydrogen gas."聽
Hydrogen gas is the fuel that galaxies use to make new stars, and most galaxies are the equivalent of a Hummer with a broken oxygen sensor, four flat tires, and a buffalo carcass strapped to the roof. Most of the gas meant to transport you gets wasted. But a new study has spotted a galaxy that is converting gas into stars at a rate hundreds of times that of our galaxy with almost 100 percent efficiency.
An international team of scientists looked at data from聽NASA's Wide-field Infrared Survey Explorer (WISE) and spotted a galaxy that was just blazing with infrared radiation, equivalent, they say, to a trillion suns. Observations from the Hubble telescope confirmed that the galaxy, which is affectionately known as聽SDSSJ1506+54, is extremely compact, with most of the infrared light pouring from an area that is a fraction of the size of our own Milky Way.聽
The researchers then used data from the IRAM Plateau de Bure interferometer in the French Alps to detect the presence of carbon monoxide, which indicates the presence of hydrogen. By combining the gas measurements with the rate of star formation, the scientists found that the galaxy was forming stars out of the gas at a rate that is close to the theoretical maximum. Their paper, which has been accepted for publication in the Journal of Astrophysical Letters, calls it "star formation at its most extreme."
A NASA press release explains just how this galaxy is achieving such efficiency:
Why is this galaxy so efficient at converting hydrogen into stars while all the others are such slouches? It actually comes down to timing. We just happen to be witnessing the time period, six billion years ago, when this galaxy produces lots of stars. The researchers speculate that this period could have been triggered by the merging of two galaxies into one.聽
In any case, it's a bright spot in our sky. As Discovery News's Ian O'Neill points out those living on a planet on the outskirts of this prolific star factory will have a "night" sky that is actually brighter than daylight.