The ever-present fog of energetic gamma rays permeating the universe isn't created by what astronomers expected, new observations from NASA's Fermi Gamma-ray Space Telescope reveal, leaving scientists with a new cosmic mystery to solve.
The sky glows in gamma rays even far away from well-known bright sources, such as pulsars and gas clouds within our own Milky Way galaxy or the most luminous active galaxies. Conventionally, astronomers thought that the accumulated glow of active galactic nuclei -- black hole-powered jets emanating from active galaxies -- accounted for most of this gamma-ray background.
"Thanks to Fermi, we now know for certain that this is not the case,
- Log in to post comments
More like this
"Black holes, which have no memory, are said to contain the earliest memories of the universe, and the most recent, too, while at the same time obliterating all memory by obliterating all its embodiments. Such paradoxes characterize these strange galactic monsters, for whom creation is destruction…
"If we knew what it was we were doing, it would not be called research, would it?" -Albert Einstein
Our galaxy is but one among hundreds of billions in the cosmos, nearly all of which contain supermassive black holes at the center. Ours happens to be "only" a few million times as massive as our Sun…
"Two recent studies by teams in the U.S. and the Netherlands have shown that the gamma-ray excess at the galactic center is speckled, not smooth as we would expect for a dark matter signal. Those results suggest the speckles may be due to point sources that we can’t see as individual sources..." -…
"When I was having that alphabet soup, I never thought that it would pay off." -Vanna White
Ever want an A-to-Z illustrated alphabet of astrophysics? Turns out that -- other than writing your own via Galaxy Zoo -- it doesn't yet exist. So I thought it would be delightful to make one for you...…
This is comforting news. I always suspected it was weird out there. Now I know.
I believe you mean "Mysterious gamma ray source is mysterious" ^.^