Nature's Most Precise Clocks May Make "Galactic GPS" Possible
An animation showing a pulsar in a binary
star system. Gas flowing from the star spins the pulsar up to
hundreds of revolutions a second, resulting lighthouse-like beams of radiation. Credit: NASA
Watch Animation: (4 MB QT)
(18.5 MB QT)
Radio astronomers have uncovered 17 millisecond pulsars in our
galaxy by studying otherwise unidentified sources detected by NASA's
Fermi Gamma-ray Space Telescope. The astronomers discovered all these
pulsars within a span of less than three months. Locating these
hard-to-find objects so rapidly holds the promise of using them as a
kind of "galactic GPS" to detect gravitational waves passing near Earth.
A pulsar is the rapidly spinning and highly magnetized core left behind when a massive star explodes. Because only rotation powers their intense gamma-ray, radio and particle emissions, pulsars gradually slow as they age. But the oldest pulsars spin hundreds of times per second -- faster than a kitchen blender. These millisecond pulsars have been spun up and rejuvenated by accreting matter from a companion star.
"Radio astronomers discovered the first millisecond pulsar 28 years ago," said Paul Ray at the Naval Research Laboratory in Washington. "Locating them with all-sky radio surveys requires immense time and effort, and we've only found a total of about 60 in the disk of our galaxy since then. Fermi points us to specific targets. It's like having a treasure map."
Click for larger image
This map of the galaxy shows the
locations (in colored cirles) of newly discovered radio pulsars that coincide
with previously unidentified Fermi gamma-ray sources. Credit: NASA/DOE/Fermi LAT Collaboration
The sources Fermi detected are not associated with any other known
gamma-ray emitting objects. Nor did they show evidence of pulsing
behavior. However, pulsars are known to be gamma-ray emitters, and
scientists considered it likely that many of Fermi's unidentified
sources might turn out to be pulsars.
So Paul Ray and his colleages set out to look at Fermi's
unidentified sources at radio wavelengths. Ray organized the Fermi Pulsar Search Consortium and recruited a handful of radio astronomers with expertise in using five of the world's largest radio telescopes -- the National Radio Astronomy Observatory, Robert C. Byrd Green Bank Telescope in W.Va., the Parkes Observatory in Australia, the Nancay Radio Telescope in France, the Effelsberg Radio Telescope in Germany and the Arecibo Telescope in Puerto Rico.
After studying approximately 100 targets, and with a computationally intensive data analysis still under way, the discoveries have started to pour in.
"Other surveys took a decade to find as many of these pulsars as we have," said Ransom, who led one of the discovery groups. "Having Fermi tell us where to look is a huge advantage."
Millisecond pulsars are nature's most precise clocks, with long-term, sub-microsecond stability that rivals human-made atomic clocks. Precise monitoring of timing changes in an all-sky array of millisecond pulsars may allow the first direct detection of gravitational waves -- a long-sought consequence of Einstein's relativity theory.
"The Global Positioning System uses time-delay measurements among satellite clocks to determine where you are on Earth," explained Scott Ransom of the National Radio Astronomy Observatory in Charlottesville, Va. "Similarly, by monitoring timing changes in a constellation of suitable millisecond pulsars spread all over the sky, we may be able to detect the cumulative background of passing gravitational waves."
In addition, Four of the new objects are "black widow" pulsars, so called because radiation from the recycled pulsar is destroying the companion star that helped spin it up.
"Some of these stars are whittled down to masses equivalent to tens of Jupiters," said Ray. "We've doubled the known number of these systems in the galaxy's disk, and that will help us better understand how they evolve."
NASA's Fermi Gamma-ray Space Telescope is an astrophysics and particle physics partnership, developed in collaboration with the Department of Energy, along with important contributions from academic institutions and partners in France, Germany, Italy, Japan, Sweden, and the U.S. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.