image: Simulated shower hitting the Milagro Detector. view more
Credit: 2000 aurore simonnet
COLLEGE PARK, Md. -- The University of Maryland-led Milagro collaboration, comprised of scientists from 16 institutions across the United States, has discovered two nearby regions with an unexpected excess of cosmic rays.
This is the second finding of a source of galactic cosmic rays relatively near Earth announced in the past week. In the November 20 issue of the journal Nature, ATIC an international experiment lead by LSU scientists and conceived by a University of Maryland physicist announced finding an unexpected surplus of cosmic-ray electrons from an unidentified, but relatively close source.
"These two results may be due to the same, or different, astrophysical phenomenon, said Jordan Goodman, a University of Maryland professor of physics and principal investigator for Milagro. However, they both suggest the presence of high-energy particle acceleration in the vicinity of the earth. Our new findings [published in the November 24 issue of Physical Review Letters] point to general locations for the localized excesses of cosmic-ray protons observed with the Milagro observatory.
Cosmic rays are actually charged particles, including protons and electrons that are accelerated to high energies from sources both outside and inside our galaxy. It's unknown exactly what these sources are, but scientists theorize they may include supernovae -- massive stars that explode -- quasars or perhaps from other even more exotic, less-understood sources within the universe. Until recently, it was widely held that cosmic-ray particles came toward Earth uniformly from all directions. These new findings are the strongest indications yet that the distribution of cosmic rays is not so uniform.
When these high energy cosmic ray particles strike the Earth's atmosphere, a large cascade of secondary particles are created in an extensive "air shower." The Milagro observatory -- located in a 60m x 80m x 8m covered pond in the Jemez Mountains near Los Alamos, New Mexico -- 'sees' cosmic rays by observing the energetic secondary particles that make it to the surface.
Jordan and his Milagro colleagues used the cosmic-ray observatory to peer into the sky above the northern hemisphere for nearly seven years starting in July 2000. The Milagro observatory is unique in that it monitors the entire sky above the northern hemisphere. Its design and field of view, made it possible for the observatory to record over 200 billion cosmic-ray collisions with the Earth's atmosphere.
This allowed researchers for the first time to see statistical peaks in the number of cosmic-ray events originating from relatively small regions of the sky. Milagro observed an excess of cosmic ray protons in an area above and to the right of Orion, near the constellation Taurus. The other hot spot is a comma-shaped region in the sky near the constellation Gemini.
"Whatever the source of the protons we observed with Milagro, their path to Earth is deflected by the magnetic field of the Milky Way so that we cannot directly tell exactly where they originate," said Goodman. "And whether the regions of excess seen by Milagro actually point to a source of cosmic rays, or are the result of some other unknown nearby effect is an important question raised by our observations."
Even more revelatory observations of cosmic rays and further help solving the mystery of the origin of cosmic rays may come in the form of a new observatory that Jordan and his fellow U.S. Milagro scientists have partnered with colleagues in Mexico to propose to the National Science Foundation. This second-generation experiment named the High Altitude Water Cherenkov experiment (HAWC) would be built at a high-altitude site in Mexico.
More about Milagro
The National Science Foundation (NSF) funded construction of the Milagro through the University of Maryland. Maryland and the Los Alamos National Laboratory are the lead research institutions in Milagro, joined by scientists from 14 other U.S. institutions. The observatory's work was funded by NSF, the US Department of Energy, Los Alamos National Laboratory, and the University of California. For more information on Milagro and HAWC, visit the University of Maryland HAWC website: http://hawc.umd.edu or contact Jordan Goodman, University of Maryland, 301-405-6033 (goodman@umdgrb.umd.edu) or Brenda Dingus, Los Alamos National Laboratory, (dingus@lanl.gov).
Latest results: "Discovery of localized regions of excess 10-TeV cosmic rays," A. A. Abdo, B. Allen, et al., Physical Review Letters,
Explore the ATIC
The Advanced Thin Ionization Calorimeter (ATIC) is an investigation directed to resolving fundamental questions about the shape of the elemental differential energy spectra from the low energy region around 10^10 eV through the highest practical energies, about 10^14 eV. This ATIC investigation takes advantage of the existing NASA long-duration balloon flight capability in Antarctica and/or the Northern Hemisphere (e.g. Fairbanks). More at: http://www.atic.umd.edu/atic.html
Latest ATIC results: "An excess of cosmic ray electrons at energies of 300� GeV," J. Chang, J. H. Adams, et al., Nature 456, 362-365 (20 November 2008
UM Conceived Experiment Finds Mysterious Cosmic Radiation http://www.newsdesk.umd.edu/scitech/release.cfm?ArticleID=1793
MEDIA CONTACTS:
Lee Tune, University of Maryland, 301 405 4679 or ltune@umd.edu
James E. Rickman, Los Alamos National Laboratory, (505) 665-9203 (04-391), elvis@lanl.gov
Journal
Physical Review Letters