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NASA X-ray Telescopes Reveal the “Bones” of a Ghostly Cosmic Hand
Washington, Nov 1, (Fast Mail News):-- In 1895, Wilhelm Röntgen discovered X-rays and used them to image the bones in his wife’s hand, kicking off a revolutionary diagnostic tool for medicine. Now two of NASA’s X-ray space telescopes have combined their imaging powers to unveil the magnetic field “bones” of a remarkable hand-shaped structure in space. Together, these telescopes reveal the behavior of a dead collapsed star that lives on through plumes of particles of energized matter and antimatter.
Around 1,500 years ago, a giant star in our Galaxy ran out of nuclear fuel to burn. When this happened, the star collapsed onto itself and formed an extremely dense object called a neutron star.
Rotating neutron stars with strong magnetic fields, or pulsars, provide laboratories for extreme physics, with conditions that cannot be replicated on Earth. Young pulsars can create jets of matter and antimatter moving away from the poles of the pulsar, along with an intense wind, forming a “pulsar wind nebula”.
In 2001, NASA’s Chandra X-ray Observatory first observed the pulsar PSR B1509-58 and revealed that its pulsar wind nebula (referred to as MSH 15-52) resembles a human hand. The pulsar is located at the base of the “palm” of the nebula. MSH 15-52 is located 16,000 light-years from Earth.
Now, NASA’s newest X-ray telescope, the Imaging X-ray Polarimetry Explorer (IXPE), has observed MSH 15-52 for about 17 days, the longest it has looked at any single object since it launched in December 2021.
“The IXPE data gives us the first map of the magnetic field in the ‘hand’,” said ?Roger Romani of Stanford University in California, who led the study. “The charged particles producing the X-rays travel along the magnetic field, determining the basic shape of the nebula, like the bones do in a person’s hand.”
IXPE provides information about the electric field orientation of X-rays, determined by the magnetic field of the X-ray source. This is called X-ray polarization. In large regions of MSH 15-52 the amount of polarization is remarkably high, reaching the maximum level expected from theoretical work. To achieve that strength, the magnetic field must be very straight and uniform, meaning there is little turbulence in those regions of the pulsar wind nebula.
“We’re all familiar with X-rays as a diagnostic medical tool for humans,” said co-author Josephine Wong, also of Stanford. “Here we’re using X-rays in a different way, but they are again revealing information that is otherwise hidden from us.”
One particularly interesting feature of MSH 15-52 is a bright X-ray jet directed from the pulsar to the “wrist” at the bottom of the image. The new IXPE data reveal that the polarization at the start of the jet is low, likely because this is a turbulent region with complex, tangled magnetic fields associated with the generation of high-energy particles. By the end of the jet the magnetic field lines appear to straighten and become much more uniform, causing the polarization to become much larger.
These results imply that particles are given an energy boost in complex turbulent regions near the pulsar at the base of the palm, and flow to areas where the magnetic field is uniform along the wrist, fingers and thumb.
“We’ve uncovered the life history of super energetic matter and antimatter particles around the pulsar,” said co-author ?Niccolò Di Lalla, also of Stanford. “This teaches us about how pulsars can act as particle accelerators.”
IXPE has also detected similar magnetic fields for the Vela and Crab pulsar wind nebulae, which implies that they may be surprisingly common in these objects.
IXPE is a collaboration between NASA and the Italian Space Agency with partners and science collaborators in 12 countries. IXPE is led by Marshall. Ball Aerospace, headquartered in Broomfield, Colorado, manages spacecraft operations together with the University of Colorado’s Laboratory for Atmospheric and Space Physics in Boulder.
NASA’s Marshall Space Flight Center manages the Chandra program. The Smithsonian Astrophysical Observatory’s Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.
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