Email a Friend
Printer Friendly
Slashdot It!
Submit to Reddit
Add to Facebook

NASA Balloon Mission Tunes in to a Cosmic Radio Mystery

January 08, 2009

Listening to the early universe just got harder. A team led by Alan Kogut of NASA's Goddard Space Flight Center in Greenbelt, Md., today announced the discovery of cosmic radio noise that booms six times louder than expected.

The finding comes from a balloon-borne instrument named ARCADE, which stands for the Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission. In July 2006, the instrument launched from NASA's Columbia Scientific Balloon Facility in Palestine, Texas, and flew to an altitude of 120,000 feet, where the atmosphere thins into the vacuum of space.

ARCADE's mission was to search the sky for heat from the first generation of stars. Instead, it found a cosmic puzzle.

"The universe really threw us a curve," Kogut says. "Instead of the faint signal we hoped to find, here was this booming noise six times louder than anyone had predicted." Detailed analysis ruled out an origin from primordial stars or from known radio sources, including gas in the outermost halo of our own galaxy. The source of this cosmic radio background remains a mystery.

Many objects in the universe emit radio waves. In 1931, American physicist Karl Jansky first detected radio static from our own Milky Way galaxy. Similar emission from other galaxies creates a background hiss of radio noise.

The problem, notes team member Dale Fixsen of the University of Maryland at College Park, is that there don't appear to be enough radio galaxies to account for the signal ARCADE detected. "You'd have to pack them into the universe like sardines," he says. "There wouldn't be any space left between one galaxy and the next."

The sought-for signal from the earliest stars remains hidden behind the newly detected cosmic radio background. This noise complicates efforts to detect the very first stars, which are thought to have formed about 13 billion years ago -- not long, in cosmic terms, after the Big Bang. Nevertheless, this cosmic static may provide important clues to the development of galaxies when the universe was less than half its present age. Unlocking its origins should provide new insight into the development of radio sources in the early universe.

"This is what makes science so exciting," says Michael Seiffert, a team member at NASA's Jet Propulsion Laboratory in Pasadena, Calif. "You start out on a path to measure something -- in this case, the heat from the very first stars -- but run into something else entirely, something unexplained."

Seiffert and Kogut announced the findings today at the 213th meeting of the American Astronomical Society in Long Beach, Calif. Four papers describing ARCADE's results have been submitted to The Astrophysical Journal.

ARCADE is the first instrument to measure the radio sky with enough precision to detect this mysterious signal. To enhance the sensitivity of ARCADE's radio receivers, they were immersed in more than 500 gallons of ultra-cold liquid helium. The instrument's operating temperature was just 2.7 degrees above absolute zero.

This is the same temperature as the cosmic microwave background (CMB) radiation, the remnant heat of the Big Bang that was itself discovered as cosmic radio noise in 1965. "If ARCADE is the same temperature as the microwave background, then the instrument's heat cannot contaminate the cosmic signal," Kogut explains.

The NASA-funded project includes scientists and engineers from NASA's Goddard Space Flight Center in Greenbelt, Md.; the Jet Propulsion Laboratory in Pasadena, Calif.; the University of California at Santa Barbara; the University of Maryland; and Brazil's National Institute for Space Research. More than a dozen high school and undergraduate students participated in the payload's development.

The balloon flight was conducted under the auspices of the Balloon Program Office at Wallops Flight Facility by the staff of the Columbia Scientific Balloon Facility.

Goddard Space Flight Center

Related Cosmic Radio Current Events and Cosmic Radio News Articles

Astronomers discover new radio signal using large balloon
A team of NASA-funded scientists, including two from UC Santa Barbara, have discovered cosmic radio noise that they find completely unexpected and exciting.

Arecibo joins global network to create 6,000-mile telescope
On May 22, Arecibo Observatory in Puerto Rico joined other telescopes in North America, South America, Europe and Africa in simultaneously observing the same targets, simulating a telescope more than 6,800 miles (almost 11,000 kilometers) in diameter.

More Cosmic Radio Current Events and Cosmic Radio News Articles

	On The Radio Cosmic Tribe (Primary Contributor)
	Cosmic Noise: A History of Early Radio Astronomy by Woodruff T. Sullivan III (Author) Providing a definitive history of the formative years of radio astronomy, this book is invaluable for historians of science, scientists and engineers. The whole of worldwide radio and radar astronomy is covered, beginning with the discoveries by Jansky and Reber of cosmic noise before World War II, through the wartime detections of solar noise, the discovery of radio stars, lunar and meteor radar experiments, the detection of the hydrogen spectral line, to the discoveries of Hey, Ryle, Lovell and Pawsey in the decade following the war, revealing an entirely different sky from that of visual astronomy. Using contemporary literature, correspondence and photographs, the book tells the story of the people who shaped the intellectual, technical, and social aspects of the field now known as...
	cosmic slop shop ( radio edits) LP by COSMIC SLOP SHOP
	Kid Galaxy My 1st RC Animal Pal Bear by Kid Galaxy Brown Bear, Brown Bear, Play with me, Play with me! An easy task for your preschool age little one. Bring this My 1st RC Animal Pals Bear out of hibernation and into your home for fun and adventure. It features an easy to use 2 button remote control. Push a button and watch it go while exclusive secondary actions practically bringing it to life. Watch while its moves forward and its mouth opens and closes, arms and legs move back and forth. Push another button and it spins around to bring it back to you. An animal friend ?bearing" nothing but fun.
	Custom Made Sharkfin Antenna for Mazda Mazda3 (2004-2009) Cosmic Blue Mica by Visual Garage
	Cosmic trance (Radio Edit) Mister Cosmic (Primary Contributor)
	Florence and the Machine (Moon) Music Poster Print - 24x36 by Poster Revolution Florence and the Machine (Moon) Music Poster Print - 24x36
	Another Asshole (Original) Cosmic Radio (Primary Contributor)
	Is your cosmic radio working? by Harry Emerson (Author)
	Stalking Around (Original) Cosmic Radio (Primary Contributor)